Three Square Geometry Problem
More links & stuff in full description below ↓↓↓

Featuring Professor Zvezdelina Stankova.
Extra footage1:    • Squares & Triangles (EXTRA FOOTAGE #1)  
Extra footage 2:    • Squares & Triangles (EXTRA FOOTAGE #2)  
Pebbling a chess board:    • Pebbling a Chessboard  Numberphile  

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