Some say the reason most manhole covers are round is that a circle cannot fall through a smaller circular hole. Which of these other two-dimensional shapes cannot fall through a hole that is the same ...
New research from the University of Waterloo is making inroads on one of the biggest problems in theoretical computer science ...
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Trying 10 Impossible Strength Challenges You Must See
In this challenge, impossible strength feats in gymnastics are attempted. What new satellite photos reveal about North Korea ...
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