3 puzzles from John Horton Conway, each explained in a minute and credited to the original work. Free on Savvy.
Conway's Game of Life runs on just two rules about which cells live or die based on their neighbours, applied to a grid, generation after generation. Most starting patterns fizzle …
— John Horton Conway (rules); Richard K. Guy (glider), Conway's Game of Life
Draw a 'ground' line, then sprout any number of connected line segments above it, like a stick-figure hedge. Two players alternate erasing one segment at a time; whenever a segment…
— John Horton Conway, On Numbers and Games
Start with 1. To build the next line, read the previous line aloud and write down what you say: '1' becomes 'one 1', so line two is 11. That becomes 'two 1s', so line three is 21. …
— John Horton Conway, The Weird and Wonderful Chemistry of Audioactive Decay