How big is the Universe? And how small is the smallest thing within it? This cute website developed by Cary Huang puts things into perspective. It lets you explore the entire range of scales, from the smallest length (the Planck length) all the way up to the entire Universe, via atoms, people, giant earthworms, planets, galaxies and more.

Worried you missed Pi day? Never fear! Thanks to the kind people of Wolfram we now have a bevy of mathematical dates to celebrate — six in November alone! November 23, or 11/23 for people in the US, is Fibonacci day as 1,1,2,3 is the start of the Fibonacci sequence. And even mathematically-minded Twilight fans have had something to celebrate...