<html class="apple-mail-supports-explicit-dark-mode"><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr">From a friend …</div><div dir="ltr"><br></div><blockquote type="cite"><div dir="ltr"><div style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div>
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<div style="box-sizing: border-box; max-width: 285px;"><a href="http://links.nova.wgbh.org/u/click?_t=ec210e94258b4741874e196b0b576467&_m=3d82bdf3907c4ef4a340ce5ba0508a2d&_e=D93BMHxHvIXsvTqH2XJJpH4txKFfuUHu4yM4CggJCUCVScK30dc6rf3_1Au42ZNVlyn0VZERhzE2OyAEAbgSfowdSkinUHoMfBjit9ZX-3p_hzgewH-2dgTETu4BIhgaByQ44aArmxDZBel2Ka7yj6bRbg67_-tsmEEhu-jcX9VKc5kqxfvp4z_jd1vypPVRB7XZqsGeRP4zaxk6BmWRvodjvFGD-v0yOSuZlEZ1XC5l6hlRUo8LSffUWaxABh00bZr4vis-II_nIFywCxqyrQ7wcACwlP8YPXobzMy1TTkF2vqsCvTaIHzmAn-INe99FCoVJ9DbpzeG7yv8Q6LCa5kfZIJeCpKyhN8F_PqqoN-W0UlofxUdEjzQABmZT8R80Z8Jdl32bKUMcdNb84jFK9SUHOzrW1DG8UdkhisxM--MjNE2uKHCB3Z09G5xnGnVpaFwvqJYg8IxXvkM2kYsnbIKE3PkoZLpk8q2aIdHma6dYRuqMMCnU1kIrJZEyZawHm6RKgOA5fC5EIId_4d0g1t_llWkvPA9Ty-OM2BkECsEJjQWapHOZ6cVNE24SaJGQ-7lwd-WBZ_5iWyiR93gAjUDtpnEb31cDeO1DjfDLYKfoOpVUsMmwKtaiKjncROK1zWPG6cVSQXPmFPFLnwU_ZOP67xfJRc98iwpT7471ZkD4q2fE9YLr2ZS-_jPYvo8FWH60xT3b2uRM4kF0lq1aA%3D%3D" target="_blank" style="box-sizing: border-box;"><img src="https://d15k2d11r6t6rl.cloudfront.net/public/users/Integrators/669d5713-9b6a-46bb-bd7e-c542cff6dd6a/ec210e94258b4741874e196b0b576467/NOVA_PBS_logo_white.png" width="285" alt="" title="" height="auto" style="box-sizing: border-box; display: block; height: auto; border: 0px; width: 285px;" data-unique-identifier=""></a></div>
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<span class="tinyMce-placeholder" style="box-sizing: border-box; word-break: break-word;">Easy as Pi? Not Exactly.</span></h1>
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<span class="tinyMce-placeholder" style="box-sizing: border-box; word-break: break-word;">March 14, 2026</span></h2>
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<span style="box-sizing: border-box; word-break: break-word; font-size: 18px;"><span style="box-sizing: border-box; word-break: break-word;">March 14th — 3/14 — has become a mathematics holiday. Pi Day. Beloved of nerds everywhere. Including yours truly. But
for me, it has a special meaning. I've always felt that Pi Day is<span class="Apple-converted-space"> </span><em style="box-sizing: border-box;">my day</em>.</span></span></div>
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<span style="box-sizing: border-box; word-break: break-word; font-size: 18px;">When I was in high school, a math teacher proposed a competition: who can memorize the most digits of pi, the famously endless number so long that every phone number and social security
number ever issued — or that will ever be issued — lies somewhere along its length. So long that if you encoded the digits as letters, you could find every work of literature ever written, past or future, somewhere in that infinite expanse.</span></div>
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<span style="box-sizing: border-box; word-break: break-word; font-size: 18px;">I took that challenge and devoted a week of pure teenage obsessiveness to the task. I maxed out at 200 digits. For a few days I held it together. Oh, how proud I was! But before
long I could only muster 150, then 100. 50 and … hubris begat defeat. I had flown too close to the blinding light of mathematical perfection.</span></div>
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<span style="box-sizing: border-box; word-break: break-word; font-size: 18px;">What I didn't appreciate then — what nobody tells you in high school — is that the digits are almost beside the point. They're a mere freak show next to the true beauty of pi.</span></div>
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<span style="box-sizing: border-box; word-break: break-word; font-size: 18px;">The symbol π was introduced by the Welsh mathematician William Jones in 1706 and popularized by Swiss mathematician Leonhard Euler. It’s thought they chose π because it's the first
letter of the Greek word<span class="Apple-converted-space"> </span><em style="box-sizing: border-box;">peripheria</em><span class="Apple-converted-space"> </span>— meaning periphery, or circumference. Before that, mathematicians simply called it "the ratio"
and wrote it out longhand every time. Obviously, that explains the appeal of crunching it down to a single Greek letter. (Though just try to figure out how to type it into your essay –<span class="Apple-converted-space"> </span><em style="box-sizing: border-box;">convenient</em><span class="Apple-converted-space"> </span>might
not be the word that comes to mind …)</span></div>
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<span style="box-sizing: border-box; word-break: break-word; font-size: 18px;">Pi is actually easy to express as a ratio — circumference divided by diameter, very clean — but the moment you try to calculate the actual number, things get gloriously messy. That's
why it's called “irrational” — it's a real number that simply cannot be written precisely in digits. Ever.</span></div>
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<span style="box-sizing: border-box; word-break: break-word; font-size: 18px;">And here's the thing about pi: It’s constantly popping up in the strangest places. It just doesn’t know how to stay in its high school trig lane! It is embedded in the formula that
describes how a pendulum swings. It's lodged in the equations governing electrical signals traveling through your nerves. Drop a needle randomly on a floor of parallel lines and the probability it crosses one involves pi — a result so bizarre it has its own
name, Buffon's Needle. Pi appears in the distribution of prime numbers. It shows up, uninvited, in Einstein's field equations describing the curvature of spacetime itself.</span></div>
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<span style="box-sizing: border-box; word-break: break-word; font-size: 18px;">Which brings me to my favorite footnote about this particular day. March 14th is also Albert Einstein's birthday. Einstein spent his life describing the universe with mathematics
— and pi was never far from the equations. Whether this is the universe's greatest coincidence or its most elegant inside joke, I honestly cannot say. But at NOVA, where we've spent decades exploring Einstein's legacy, it feels exactly right.</span></div>
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<span style="box-sizing: border-box; word-break: break-word; font-size: 18px;">NASA navigates interplanetary spacecraft using just 15 digits of pi. To calculate the circumference of a circle the size of the observable universe to within the width of a single
hydrogen atom, you'd need only 39. My 200-digit teenage party trick was, it turns out, 161 digits of pure exuberant excess.</span></div>
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<span style="box-sizing: border-box; word-break: break-word; font-size: 18px;">But I don't regret a single one of them. Pi is one of those places where math stops being a tool and starts being a window — onto something strange and beautiful about the universe
we live in.</span></div>
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<strong style="box-sizing: border-box;"><span style="box-sizing: border-box; word-break: break-word; font-size: 18px;">Happy Pi Day!</span></strong></div>
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<span class="tinyMce-placeholder" style="box-sizing: border-box; word-break: break-word;">WATCH</span></h1>
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<td class="divider_inner" style="box-sizing: border-box; font-size: 1px; line-height: 1px; border-top-width: 14px; border-top-style: solid; border-top-color: rgb(158, 186, 255);">
<span style="box-sizing: border-box; word-break: break-word;"> </span></td>
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<div class="fullWidth" style="box-sizing: border-box; max-width: 360px;"><a href="http://links.nova.wgbh.org/u/click?_t=ec210e94258b4741874e196b0b576467&_m=3d82bdf3907c4ef4a340ce5ba0508a2d&_e=D93BMHxHvIXsvTqH2XJJpHI3cxq-zxLa5HAApgsGRpXj-xNwfGKUsPn1m226GSvdoArpGFS8g9T0FDmEzEi01lPhOWjeL6lGNMT5OtsXeQ02dSkZCgBDoyGqC0T53Yzf78KyEi7dfWLJHFwAQkL-Efv2ECchun3xn4XjMlDD7vHEMbRQIgzsrywDdAVJjgfpm0IGie2uKLIvpNnlFoyKgx0oMQsStyrlFeKs15UTQhw0DQhjE0seoPADK1xfgr7w-e5cA3pkkCauXhYn4wtqI5dAMXvXbIVKusNFzWULZ4B3rIOApGUH9Cj8wXP7JHqkPxB3CZP-ZHChriWZPwQKkND-qS04vgcoTtaOXVYshpdhFEdR6HuE5QlEV7IZbrZC6RiPF1hHxWrirRe6Lc0L5sZA7ScdLozeI3Y2re9lIFptbodIktXgfRJt3rBaGjqxP2vw4En6EcSIy7ku2qYyqCZY3C9iwYfHd9QPwm7Zyuk5Sd_bZRq3U0qOfYak0oeC" target="_blank" style="box-sizing: border-box;"><img src="https://library.iterable.com/1655/5706/0f37f4564e5c4475accf62be249022f9-youtube-short-thumb-22.png" width="360" alt="" title="" height="auto" style="box-sizing: border-box; display: block; height: auto; border: 0px; width: 360px;" data-unique-identifier=""></a></div>
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<span style="box-sizing: border-box; word-break: break-word;"> </span></td>
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<table class="row-content stack" align="center" border="0" cellpadding="0" cellspacing="0" role="presentation" width="600" style="box-sizing: border-box; border-radius: 0px; width: 600px; margin: 0px auto;">
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<td class="column column-1" width="100%" align="left" valign="top" style="box-sizing: border-box; font-weight: 400; text-align: left; padding-bottom: 5px; padding-top: 5px; vertical-align: top;">
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<td class="pad" width="100%" style="box-sizing: border-box; padding-top: 10px; width: 600px;">
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<div style="box-sizing: border-box; max-width: 600px;"></div>
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<table class="row-content stack" align="center" border="0" cellpadding="0" cellspacing="0" role="presentation" width="600" bgcolor="#fff" style="box-sizing: border-box; background-color: rgb(255, 255, 255); border-radius: 0px; width: 600px; margin: 0px auto;">
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<img border="0" width="1" height="1" alt="" src="https://post.spmailtechnol.com/q/gx26ZD7ED9DHAiGj5LYNHg~~/AAQTmxA~/yaq6Pu4OLf0MAbzQXMrv8KcAL9MARI6HlO1uCWxWtHrWf_-KRB3-V3HOdYGRgVKOoOtPRrtmdDVusXjZGJ4D2g~~" style="box-sizing: border-box; caret-color: rgb(0, 0, 0); font-family: LucidaGrande; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" data-unique-identifier=""><span style="caret-color: rgb(0, 0, 0); font-family: LucidaGrande; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;"></span></div>
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