Ham Sandwich Problem
This video features Dr Hannah Fry.
Check out Brilliant.org: https://brilliant.org/numberphile (20% off premium subscription)
That circle cutting problem on Brilliant: https://brilliant.org/NumberphileSandwich
Hannah Fry on Twitter: https://twitter.com/FryRsquared
Read about Hannah's Xmas book (and buy a copy to show her some support!): http://www.bradyharanblog.com/blog/hannahs-book
More Hannah videos on Numberphile: http://bit.ly/hannah_vids
Animation by Pete McPartlan