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Posted on August 06, 2016

Moscow Math Olympiad Puzzle
How can you and a friend publicly communicate about cards you are holding without a third person knowing?

Posted on April 15, 2012

Space - It's mindbogglingly big!
Trying to get a handle on just how big the universe is ...

Posted on March 04, 2017

NSA Easter Egg Puzzle
A puzzle to determine the better strategy to hunt for Easter Eggs in sealed boxes.

Posted on March 14, 2013

Hex words
The value of xDEAD people?