A web app that works out how many seconds ago something happened. How hard can coding that be? Tom Scott explains how time twists and turns like a twisty-turny thing. Its not to be trifled with!

A Universe of Triangles: www.youtube.com/watch?v=KdyvizaygyY
LZ Compression in Text: www.youtube.com/watch?v=goOa3DGezUA
Characters, Symbols and the Unicode Miracle: www.youtube.com/watch?v=MijmeoH9LT4

More from Tom Scott: www.youtube.com/user/enyay and twitter.com/tomscott

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Harans Numberphile. See the full list of Bradys video projects at: bit.ly/bradychannels