https://hiddeninpi.com/notes/ Short, friendly articles about π from Hidden in π. en-gb Fri, 02 Oct 2026 00:00:00 GMT https://hiddeninpi.com/notes/feynman-point/https://hiddeninpi.com/notes/feynman-point/Fri, 02 Oct 2026 00:00:00 GMTSix 9s in a row at decimal 762, a zero that is late for its own party, and why streaks that look impossible are exactly what randomness looks like.feynman-pointpatternsprobability https://hiddeninpi.com/notes/history-of-pi/https://hiddeninpi.com/notes/history-of-pi/Fri, 02 Oct 2026 00:00:00 GMTPolygons in Syracuse, a record that stood for 900 years, a mistake that went unnoticed for decades and a computer that ran for 157 days: the race for π's digits.historyrecordscomputing https://hiddeninpi.com/notes/how-far-apart/https://hiddeninpi.com/notes/how-far-apart/Fri, 02 Oct 2026 00:00:00 GMTWhy short names win name fights, why the gap between two names is usually about as big as their depth, and why a distance in π says nothing about your love life.couplesname-fightprobability https://hiddeninpi.com/notes/how-we-search/https://hiddeninpi.com/notes/how-we-search/Fri, 02 Oct 2026 00:00:00 GMTThe trick behind Hidden in π: we read every digit once, in advance, and wrote the answers in one enormous table. Here is how that table works.how-it-workssearchtables https://hiddeninpi.com/notes/is-every-number-in-pi/https://hiddeninpi.com/notes/is-every-number-in-pi/Fri, 02 Oct 2026 00:00:00 GMTYou have heard that π contains every phone number and every birthday. Maybe it does. Here is what mathematicians have proved, and what they only strongly suspect.normal-numbersproofmaths https://hiddeninpi.com/notes/life-of-pi/https://hiddeninpi.com/notes/life-of-pi/Fri, 02 Oct 2026 00:00:00 GMTYann Martel's novel and Ang Lee's film about a boy called Pi, why a never-ending number suits his story, and why your own name is probably in π too.booksfilmnamesstory https://hiddeninpi.com/notes/pi-day-classroom/https://hiddeninpi.com/notes/pi-day-classroom/Fri, 02 Oct 2026 00:00:00 GMTFive activities for 14 March that need nothing but string, paper plates and a browser, plus a worksheet you can print straight from this page.pi-dayclassroomteachers https://hiddeninpi.com/notes/the-idea/https://hiddeninpi.com/notes/the-idea/Fri, 02 Oct 2026 00:00:00 GMTHow one podcast conversation about phone numbers in π turned into a search of 100 billion digits, and a thank-you to the show that started it.storythanksbehind-the-scenes https://hiddeninpi.com/notes/why-your-number-is-in-pi/https://hiddeninpi.com/notes/why-your-number-is-in-pi/Fri, 02 Oct 2026 00:00:00 GMTThe maths behind our favourite figure, 99.995%: how a lottery, a ten-sided dice and the number e explain why almost every phone number turns up in the digits we search.probabilityphone-numbersmaths