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Why nearly every species makes sons and daughters in equal numbers: Fisher's grandchildren argument Boys and girls are born in nearly equal numbers, about 105 boys for every 100 girls worldwide, even though one male could father far more children than one… Biology5 min read Why swapping cards at random is not a fair shuffle: Fisher–Yates and the 27 paths Shuffling three cards by swapping each one with a random card from the whole row looks fair, but it is not. It makes 3 × 3 × 3 = 27 equally likely paths for… Computing4 min read Why shared fish, fields and water get used up, and how some places don't When something is shared and nobody controls it, taking a bit more is always worth it for you. You keep the whole gain; the damage is split among everyone… Economics6 min read