Two decades ago, the mathematician Moon Duchin spent her summers teaching geometry at Mathcamp, a program for mathematically talented teens. Campers contemplated notions such as how to prove whether a ...
11hon MSN
Optical Illusion: Can you spot the inverted ‘68’ among inverted ‘89s’ in 8 seconds?
Test your sharp vision with a tricky optical illusion. Find the hidden inverted '68' within a grid of inverted '89s'. You ...
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