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Why fishing less gave the Adriatic more sharks: foxes, rabbits and a loop
When fishing slowed during the First World War, the Adriatic catch held a bigger share of sharks and rays, not a smaller one. Mathematician Vito Volterra…
How a leopard gets its spots: Turing's two-chemical pattern machine
A leopard's spots and a zebra's stripes start out as a smooth sheet of near-identical cells. In 1952 Alan Turing showed that two interacting chemicals, one…
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…