On Pi Day, finding strength in numbers

<div dir="ltr" style="text-align: left;" trbidi="on"><div dir="ltr" style="text-align: left;" trbidi="on"><br /></div><object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" height="234" id="ep_496" width="416"><param name="allowfullscreen" value="true" /><param name="allowscriptaccess" value="always" /><param name="wmode" value="transparent" /><param name="movie" value="http://i.cdn.turner.com/cnn/.element/apps/cvp/3.0/swf/cnn_embed_2x_container.swf?site=cnn&profile=desktop&context=embed&videoId=us/2013/03/14/dnt-piece-of-pi-314.cnn&contentId=us/2013/03/14/dnt-piece-of-pi-314.cnn" /><param name="bgcolor" value="#000000" /><embed src="http://i.cdn.turner.com/cnn/.element/apps/cvp/3.0/swf/cnn_embed_2x_container.swf?site=cnn&profile=desktop&context=embed&videoId=us/2013/03/14/dnt-piece-of-pi-314.cnn&contentId=us/2013/03/14/dnt-piece-of-pi-314.cnn" type="application/x-shockwave-flash" bgcolor="#000000" allowfullscreen="true" allowscriptaccess="always" width="416" wmode="transparent" height="234"></embed></object><br /><br /><div class="cnnEditorialNote" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><em style="border: 0px; font-family: inherit; margin: 0px; padding: 0px; vertical-align: baseline;"><strong style="margin: 0px; padding: 0px;">Editor's note:</strong> <a href="http://www.facebook.com/DanielTammetAuthor" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank">Daniel Tammet is on Facebook</a> and his personal website is <a href="http://www.danieltammet.net/" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank">danieltammet.net</a>. <a href="http://www.ted.com/talks/daniel_tammet_different_ways_of_knowing.html" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank">Watch his TED talk here.</a></em></div><div style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><strong style="margin: 0px; padding: 0px;">(CNN)</strong> -- In Daniel Tammet's mind, three is a dotted green crescent moon shape, one is a sort of white sunburst and four is a blue boomerang. Every number has a distinct color and shape, making the number pi, which begins with 3.14, unfold like a beautiful poem.</div><div class="cnn_storypgraphtxt cnn_storypgraph2" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">For math enthusiasts around the world, March 14 (3-14) is <a href="http://www.cnn.com/2010/TECH/03/12/pi.day.math/index.html" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;">Pi Day</a>, honoring the number pi, which is the ratio of circumference to diameter of a circle. On Thursday, Tammet is promoting France's first Pi Day celebration at the Palace of Discovery science museum in Paris.</div><div class="cnn_storypgraphtxt cnn_storypgraph3" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Tammet's relationship to this number is special: At age 25, he recited 22,514 digits of pi from memory in 2004, scoring the European record. For an audience at the Museum of the History of Science in Oxford, he said these numbers aloud for 5 hours and 9 minutes. Some people cried -- not out of boredom, but from sheer emotion from his passionate delivery.</div><div class="cnn_storypgraphtxt cnn_storypgraph4" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">"What my brain was doing was inventing a meaning, like a story," Tammet said. "What I did was make a poem or a novel out of pi, and took those colors and those emotions and used them to perceive patterns, or at least to perceive patterns in my mind that were memorable, that were meaningful to me."</div><div class="cnn_storypgraphtxt cnn_storypgraph5" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Many people around the world -- including me -- have been interested enough in this number, or in memorization itself, to see how many digits they can bank. Pi has infinitely many digits with no discernible pattern, yet it mathematically explains the shape of all circles. This makes memorizing it a difficult, yet somehow meaningful, challenge.</div><div class="cnn_storypgraphtxt cnn_storypgraph6" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Serious pi memorizers such as Tammet have become fascinating subjects of study for scientists, too. They bring up fundamental questions about innate ability vs. learned skills. Are the brains of people with superior memory somehow different? Or can anyone learn thousands of random digits?</div><div class="cnn_storypgraphtxt cnn_storypgraph7" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><a href="http://lightyears.blogs.cnn.com/2012/03/13/pi-day-how-3-14-helps-find-other-planets-and-more/" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;">How pi is used in real science</a></div><div class="cnn_storypgraphtxt cnn_storypgraph8" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><strong style="margin: 0px; padding: 0px;">Making meaning out of number</strong><strong style="margin: 0px; padding: 0px;">s</strong></div><div class="cnn_storypgraphtxt cnn_storypgraph9" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Superior memorizers, according to the research of K. Anders Ericsson, professor of psychology at Florida State University, have three special skills. They use knowledge and patterns that they already know to encode information in their long-term memory. They associate that information with retrieval cues, so that they can trigger the information again. They also get faster at all this by becoming better at encoding and retrieval through intense practice and effort.</div><div class="cnn_storypgraphtxt cnn_storypgraph10" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">This theory appears to explain Chao Lu, who set the current world record for pi recitation at 67,890 digits in 2005, at age 23. Creating associated meanings in numbers played a big part of that. He used mnemonics relating to the sounds of numbers as well as the shapes or meanings of particular digits and images, according to a 2009 study by Ericsson and colleagues.</div><div class="cnn_storypgraphtxt cnn_storypgraph11" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Strangely, if presented with one number at a time, at one digit per second, Lu's recall is no better than the average person's, Ercisson and colleagues found. With that rate of presentation of numbers, he is forced to rehearse numbers in his head just like everyone else, Ericsson said.</div><div class="cnn_storypgraphtxt cnn_storypgraph12" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><a href="http://eatocracy.cnn.com/2012/03/14/national-pie-day/" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank">Sweet recipes for national pi(e) day</a></div><div class="cnn_storypgraphtxt cnn_storypgraph13" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">But with large blocks of numbers, it's a different story. Lu and a previous pi-memorizing record holder, Hideaki Tomoyori, who recited 40,000 digits of pi, have said they linked words or images to groups of two, three or four numbers. Then they created stories connecting them. Tomoyori practiced daily, spending between 9,000 and 10,000 hours total memorizing before his recitation.</div><div class="cnn_storypgraphtxt cnn_storypgraph14" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">A rare case was Rajan Mahadevan, who set a record at 31,811 digits of pi and did not report using any mnemonics. When tested by researchers, it appeared he sequentially memorized numbers in blocks of 10. While some argued that Mahadevan may have an innate ability to memorize, Ericsson and colleagues found in their experiments with Mahadevan that he learned his unusual methods for memorizing numerical patterns after a thousand hours of practice.</div><div class="cnn_storypgraphtxt cnn_storypgraph15" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Amateurs have their own methods and perceptions. Lulis Leal, 47, of New York, is also getting in on the pi memorization action. Inspired by a CNN iReport assignment, she is up to 314 digits and<a href="http://ireport.cnn.com/docs/DOC-940885" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank">recorded herself reciting them</a>.</div><div class="cnn_storypgraphtxt cnn_storypgraph16" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">"It's a visual thing," she said of pi. "It's just a picture that I see -- a line going up and down."</div><div class="cnn_storypgraphtxt cnn_storypgraph17" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Listening to Leal's recitation is jarring for me because I hear it in a different rhythm, as though it were a song with the down-beat on every other digit. When I was a teenager I saw a website suggesting pi could be a song, with one as middle C, two as D, three as E, etc. This helped me get up to 178 digits in college, winning me a T-shirt.</div><div class="cnn_storypgraphtxt cnn_storypgraph18" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><a href="http://scitech.blogs.cnn.com/2009/03/13/pi-day-and-american-pi/" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;">A Pi Day song: 'American Pi'</a></div><div class="cnn_storypgraphtxt cnn_storypgraph19" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><strong style="margin: 0px; padding: 0px;">The neuroscience of expert memor</strong><strong style="margin: 0px; padding: 0px;">y</strong></div><div class="cnn_storypgraphtxt cnn_storypgraph20" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">There's no straightforward control over what we remember and what we forget; we all wish we could remember some things and forget others. But it is possible to train as a mental athlete, and there are entire competitions around that, said Joshua Foer, author of "Moonwalking With Einstein" and memory championship winner.</div><a href="" name="em1" style="background-color: white; border: 0px; font-family: Arial, Helvetica, Utkal, sans-serif; font-size: 12px; line-height: 18px; margin: 0px; padding: 0px; vertical-align: baseline;"></a><span style="background-color: white; font-family: Arial, Helvetica, Utkal, sans-serif; font-size: 12px; line-height: 18px;"></span><div class="cnn_strylftcntnt cnn_strylftcexpbx" id="expand121" style="background-color: white; border: 0px; clear: left; float: left; font-family: Arial, Helvetica, Utkal, sans-serif; font-size: 12px; line-height: 18px; margin: 0px 0px 20px; padding: 0px 27px 0px 10px; position: relative; vertical-align: baseline;"><div class="clickToPlay" id="clickToPlayvideoContainerexpand121" style="background-image: url(http://i.cdn.turner.com/cnn/.e/img/3.0/video/416_player_Click_to_play_off.png); border: 0px; cursor: pointer; font-family: inherit; font-style: inherit; height: 42px; left: 45px; margin: 0px; padding: 0px; position: absolute; top: 27px; vertical-align: baseline; width: 136px; zoom: 1;"></div><img alt="" border="0" class="box-image" height="120" src="http://i2.cdn.turner.com/cnn/dam/assets/120608035513-ideas-josh-foer-story-body.jpg" style="border: 0px; cursor: pointer; font-family: inherit; font-style: inherit; margin: 0px; padding: 0px; vertical-align: baseline;" width="214" /><cite class="expCaption" style="background-color: black; background-position: initial initial; background-repeat: initial initial; bottom: 0px; height: 20px; left: 10px; margin: 0px; opacity: 0.85; padding: 0px; position: absolute; width: 214px;"><span style="border: 0px; color: white; display: block; float: left; font-family: inherit; font-size: 11px; font-style: normal; left: 4px; margin: 0px 0px 20px; overflow: hidden; padding: 0px; position: relative; top: 2px; vertical-align: baseline;">Memory myths since Socrates' time</span></cite></div><a href="" name="em2" style="background-color: white; border: 0px; font-family: Arial, Helvetica, Utkal, sans-serif; font-size: 12px; line-height: 18px; margin: 0px; padding: 0px; vertical-align: baseline;"></a><span style="background-color: white; font-family: Arial, Helvetica, Utkal, sans-serif; font-size: 12px; line-height: 18px;"></span><div class="cnn_strylftcntnt cnn_strylftcexpbx" id="expand221" style="background-color: white; border: 0px; clear: left; float: left; font-family: Arial, Helvetica, Utkal, sans-serif; font-size: 12px; line-height: 18px; margin: 0px 0px 20px; padding: 0px 27px 0px 10px; position: relative; vertical-align: baseline;"><div class="clickToPlay" id="clickToPlayvideoContainerexpand221" style="background-image: url(http://i.cdn.turner.com/cnn/.e/img/3.0/video/416_player_Click_to_play_off.png); border: 0px; cursor: pointer; font-family: inherit; font-style: inherit; height: 42px; left: 45px; margin: 0px; padding: 0px; position: absolute; top: 27px; vertical-align: baseline; width: 136px; zoom: 1;"></div><img alt="" border="0" class="box-image" height="120" src="http://i2.cdn.turner.com/cnn/dam/assets/120608053352-ted-joshua-foer-feats-of-memory-00180815-story-body.jpg" style="border: 0px; cursor: pointer; font-family: inherit; font-style: inherit; margin: 0px; padding: 0px; vertical-align: baseline;" width="214" /><cite class="expCaption" style="background-color: black; background-position: initial initial; background-repeat: initial initial; bottom: 0px; height: 20px; left: 10px; margin: 0px; opacity: 0.85; padding: 0px; position: absolute; width: 214px;"><span style="border: 0px; color: white; display: block; float: left; font-family: inherit; font-size: 11px; font-style: normal; left: 4px; margin: 0px 0px 20px; overflow: hidden; padding: 0px; position: relative; top: 2px; vertical-align: baseline;">Feats of memory anyone can do</span></cite></div><div class="cnn_storypgraphtxt cnn_storypgraph21" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">"Why do people memorize pi? Why do people climb Mount Everest? You don't need to do it," Foer said. "There's something about wanting to see how far you can go and how much you can push yourself."</div><div class="cnn_storypgraphtxt cnn_storypgraph22" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><a href="http://www.cnn.com/2012/06/10/opinion/foer-ted-memory" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;">Foer: How to train your mind to remember anything</a></div><div class="cnn_storypgraphtxt cnn_storypgraph23" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">For memorization, it helps to find meaning in the information and tie it to multiple senses, such as auditory and visual, said Dara Manoach, associate professor of psychology at Harvard Medical School and researcher at Massachusetts General Hospital.</div><div class="cnn_storypgraphtxt cnn_storypgraph24" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">An area of the brain called the dorsal lateral prefrontal cortex gets activated when you're holding information online -- for instance, keeping a phone number in your head until you can write it down or call it. Associating a number with sensations, and integrating it with existing knowledge, engages more neural systems and helps you store the information.</div><div class="cnn_storypgraphtxt cnn_storypgraph25" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Studies of people with exceptional memory have not found any structural differences between their brains and those of people with average memory, Ericsson said.</div><div class="cnn_storypgraphtxt cnn_storypgraph26" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">But researchers have found differences in the activation of certain brain areas in exceptional memorizers. The patterns reveal at the neurological level how people with "good memory performance" are associating new information with things they already know, such as familiar numbers like area codes or other semantic information.</div><div class="cnn_storypgraphtxt cnn_storypgraph27" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Ericsson's take on becoming an expert at something, such as memorizing pi, is deliberate practice. His research basis for the idea, popularized by Malcolm Gladwell, is that it takes 10,000 hours to achieve expertise. But Ericsson pointed out that this was based on studies of musicians in top groups who spent an average of 10,000 hours at practice. That means some spent more time and some spent less.</div><div class="cnn_storypgraphtxt cnn_storypgraph28" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">"To win an international piano competition, I calculated that you need about 25,000 hours of piano training," Ericsson said.</div><div class="cnn_storypgraphtxt cnn_storypgraph29" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">That doesn't mean there aren't people who can just memorize numbers without connecting them with anything else -- but, said Ericsson, "so far I've yet to see anybody who is willing to be tested."</div><div class="cnn_storypgraphtxt cnn_storypgraph30" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><a href="http://www.cnn.com/2011/TECH/innovation/03/14/pi.tau.math/index.html" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;">On Pi Day, is 'pi' under attack?</a></div><div class="cnn_storypgraphtxt cnn_storypgraph31" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><strong style="margin: 0px; padding: 0px;">A coincidence of sense</strong><strong style="margin: 0px; padding: 0px;">s</strong></div><div class="cnn_storypgraphtxt cnn_storypgraph32" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">There are, however, ways in which Tammet may inherently have a different approach to numbers than most pi memorizers.</div><div class="cnn_storypgraphtxt cnn_storypgraph33" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Tammet has high-functioning autism, a developmental condition associated with impaired social communication and repetitive behaviors or fixated interests. On top of that, he has <a href="http://thechart.blogs.cnn.com/2010/11/17/on-the-brain-when-numbers-have-color-synesthesia/" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank">synesthesia</a>, meaning he experiences a mixing of senses and perceptions -- specifically, he sees words and numbers as colors and shapes.</div><div class="cnn_storypgraphtxt cnn_storypgraph34" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><a href="http://www.cnn.com/2012/04/01/health/mental-health/autism-asperger-diagnoses-profile" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank">With autism, no longer invisible</a></div><div class="cnn_storypgraphtxt cnn_storypgraph35" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">In an analysis of Tammet's case, published by Simon Baron-Cohen and colleagues in the <a href="http://docs.autismresearchcentre.com/papers/2007_BC_Savant_J%20Consc%20St.pdf" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank">Journal of Consciousness Studies in 2007</a>, researchers wrote that both autism and synesthesia, while different, are associated with an excess of neural connections; it's possible they have a "common neural abnormality." They also proposed the idea that autism and synesthesia together may have increased the likelihood of Tammet's savant memory. More research is needed to support both these ideas.</div><div class="cnn_storypgraphtxt cnn_storypgraph36" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Foer's book questions whether Tammet has used mnemonic methods to memorize digits of pi and other information, just like everyone else without synesthesia. But Julian Asher at the Autism Research Centre at the University of Cambridge, who studied Tammet, said synesthesia is "fundamental to his feats of memory." Recalling pi for Tammet is like "walking through a synaesthetic landscape in which different numbers are represented by geographical features, and 'reading' them off as he goes," Asher said in an e-mail.</div><div class="cnn_strylftcntnt" style="background-color: white; border: 0px; clear: left; float: left; font-family: Arial, Helvetica, Utkal, sans-serif; font-size: 12px; line-height: 18px; margin: 0px; padding: 0px 0px 0px 10px; position: relative; vertical-align: baseline;"><div class="cnn_strylctcntr cnn_strylccimg300" style="border: 0px; color: #666666; font-family: arial; font-size: 11px; line-height: 14px; margin: 0px 22px 20px 0px; padding: 0px; vertical-align: baseline; width: 300px;"><div class="cnn_strylccimg300cntr" style="border: 0px; font-family: inherit; font-style: inherit; height: 169px; margin: 0px 0px 8px; overflow: hidden; padding: 0px; position: relative; vertical-align: baseline; width: 300px;"><img alt="Daniel Tammet, 34, recited more than 22,000 digits of pi in 2004. He has high-functioning autism." border="0" class="box-image" height="169" src="http://i2.cdn.turner.com/cnn/dam/assets/130313104452-daniel-tammet-story-body.jpg" style="border: 0px; font-family: inherit; font-style: inherit; margin: 0px; padding: 0px; vertical-align: baseline;" width="300" /></div><div style="border: 0px; font-family: inherit; font-style: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">Daniel Tammet, 34, recited more than 22,000 digits of pi in 2004. He has high-functioning autism.</div></div></div><div class="cnn_storypgraphtxt cnn_storypgraph37" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Tammet grew up as the oldest of nine children. The stimulation he received from his large family probably helped him develop social skills, he said.</div><div class="cnn_storypgraphtxt cnn_storypgraph38" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">"If I hadn't had that love and that patience and that support from an early age, I might not be where I am today, certainly," he said.</div><div class="cnn_storypgraphtxt cnn_storypgraph39" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">As a child, he was called "private," "shy" and "timid." He also had epileptic seizures, and took medication until he grew out of them.</div><div class="cnn_storypgraphtxt cnn_storypgraph40" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">"When he sat on the carpet during story time, with his eyes tight shut and his fingers in his ears, picturing numbers in his mind and their shapes and colors, whilst the other children looked at each other or at the teacher and listened to the story, (Tammet) was in some sense in a world of his own," Baron-Cohen and colleagues wrote.</div><div class="cnn_storypgraphtxt cnn_storypgraph41" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><a href="http://geekout.blogs.cnn.com/2012/04/23/geekiness-and-autism-is-there-a-connection/" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;" target="_blank">Geekiness and autism: Is there a connection?</a></div><div class="cnn_storypgraphtxt cnn_storypgraph42" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">In high school, Tammet learned about pi and thought it was beautiful. But when he talked about it with his classmates, they didn't understand. For them, pi was just a number. It didn't have any color or beauty or emotion.</div><div class="cnn_storypgraphtxt cnn_storypgraph43" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">"That's when I had a perception of the world, of words, of numbers, that was different," he said. Secretly, he started memorizing digits of pi.</div><div class="cnn_storypgraphtxt cnn_storypgraph44" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><a href="http://lightyears.blogs.cnn.com/2013/03/14/pi-day-25-years-in-san-francisco/" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;">San Francisco museum celebrates 25 years of Pi Day</a></div><div class="cnn_storypgraphtxt cnn_storypgraph45" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><strong style="margin: 0px; padding: 0px;">Finding life throug</strong><strong style="margin: 0px; padding: 0px;">h</strong><strong style="margin: 0px; padding: 0px;"> pi</strong></div><div class="cnn_storypgraphtxt cnn_storypgraph46" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">At age 25, Tammet finally felt confident enough to "share all those years of loneliness, all those years of battling with this condition, with my autism, all the years of also experiencing this tremendous beauty, this emotion."</div><div class="cnn_storypgraphtxt cnn_storypgraph47" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">He spent about three months learning thousands of digits of pi, which he saw as an emotional experience, being transported into another world.</div><div class="cnn_storypgraphtxt cnn_storypgraph48" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Tammet's achievement of the European record for pi recitation wasn't about showing off, he said. First and foremost, he wanted to accomplish something that meant something to him personally. He was able to reach out to people without autism, without synesthesia, and communicate to them in a new way. The event also benefited an epilepsy charity.</div><div class="cnn_storypgraphtxt cnn_storypgraph49" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">"When the digits darken in my mouth — heavy eights and nines packed together — the tense distant faces grow tenser still. When a sudden three emerges from a series of zeroes and sevens, I hear something like a faint collective pant. Silent nods greet my accelerations; warm smiles welcome my slowdowns," he wrote in his book "Thinking in Numbers," which comes out in the United States in July.</div><div class="cnn_storypgraphtxt cnn_storypgraph50" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">At the pi recitation, Tammet realized he had a gift of communicating, and that set him on the path to becoming a full-time writer.</div><div class="cnn_storypgraphtxt cnn_storypgraph51" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">The pi memorization event also led Tammet to Baron-Cohen and colleagues, who made the diagnosis of high-functioning autism. It explained the difficulties he had with communication and social skills as a child.</div><div class="cnn_storypgraphtxt cnn_storypgraph52" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">He has not recited pi since the 2004 event, but still appreciates the beauty and wonder of the number enough to promote Pi Day in France.</div><div class="cnn_storypgraphtxt cnn_storypgraph53" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">"You can find a lover's telephone number. Your date of birth. Your Social Security code. You can find everything in pi," he said. "It's big enough to have all of life inside of it."</div><div class="cnn_storypgraphtxt cnn_storypgraph54" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;">Want to memorize pi? <a href="http://www.cnn.com/2010/TECH/03/12/pi.digits/index.html" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;">Here are 10,000 digits</a>.</div><div class="cnn_storypgraphtxt cnn_storypgraph55" style="background-color: white; border: 0px; font-family: arial; font-size: 14px; line-height: 19px; padding: 0px 24px 19px 186px; vertical-align: baseline;"><a href="http://www.cnn.com/space" style="border: 0px; color: #004276; font-family: inherit; font-style: inherit; margin: 0px; outline: 0px; padding: 0px; text-decoration: none; vertical-align: baseline;">More space and science news from CNN Light Years</a></div></div>

Pi On Pi Day, finding strength in numbers

Editor's note: Daniel Tammet is on Facebook and his personal website is danieltammet.net. Watch his TED talk here.(CNN) -- In Daniel Tammet's mind, three is a dotted green crescent moon shape, one is a sort of white sunburst and four is a blue boomer…

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