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Distribution of numbers on roulette wheels

Standard Deviation Puzzle: Add a number to set {1,2,3} leaving the STD constant

Can you save money by filling up with gas when it is cold?

Pi, PINs and Permutations

Simpson's Paradox

The 13th is more likely to be a Friday than any other day

Prison escape puzzle using chessboard and coins

Calculus, rope swings, and the optimal release angle

Combining all the iPads in the World into one device

Why cans of soup are shaped the way they are

The most efficient way to tessellate circles in a square

21 Bite-sized puzzles that coders will love

How to shuffle lists and run a lottery using just a pen and paper

The 13th day of a month is more likely to be Friday than any other day