This week: The big cheese. It's Euclid time. Come with me on a journey through his optics, astronomy and or course the elements - a week of exceptionally good maths.

The Music was:

"Danse Macabre - Finale" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/