The problem of infinite Pi(e)
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Pi is the ratio between a circle\\u2019s diameter and its circumference. Sounds dull \\u2013 but pi turns out to have astonishing properties and crop up in places you would never expect. For a start, it goes on forever and never repeats, meaning it probably contains your name, date of birth, and the complete works of Shakespeare written in its digits.
Maths comedian Matt Parker stuns Adam with his \\u2018pie-endulum\\u2019 experiment, in which a chicken and mushroom pie is dangled 2.45m to form a pendulum which takes *exactly* 3.14 seconds per swing.
Mathematician Dr Vicky Neale explains how we can be sure that the number pi continues forever and never repeats - despite the fact we can never write down all its digits to check! She also makes the case that aliens would probably measure angles using pi because it\\u2019s a fundamental constant of the universe.
Nasa mission director Dr Marc Rayman drops in to explain how pi is used to navigate spacecraft around the solar system. And philosopher of physics Dr Eleanor Knox serves up some philoso-pi, revealing why some thinkers have found pi\\u2019s ubiquity so deeply mysterious.
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