The Amazing Eratosthenes
Channel: LilliBean Productions
Date: 2015-04-05

THIS VERSION SUPERSEDED: update to new video asap:
https://www.youtube.com/watch?v=qpuf9leul3A
Please use improved version  (update links & share around)

Eratosthenes measures the earth in 240 BC 
History, science, math & geometry for curious kids of all ages :-)