Here are the top 5 essays from the 40 finalists of this year's FQXi essay contest, based on the community ratings. Unofficia...

My Ph.D. Thesis Singular General Relativity was published at Minkowski Institute Press and can be ordered at Amazon .

The Monty Hall problem The Monty Hall problem is inspired by an American television game show. There are three doors, and behind one of...

Bertrand Russell said that there are no round squares. But there are. Here are two solutions. A circle-square This is a square that is...

The problem In how many ways you can arrange $p$ coins in a sequence of towers? (it doesn't matter whether the coins can be flipped...