LifeBusy doing nothing: How sloths mastered life in the slow laneOnce defamed as slow and stupid, sloths are now recognised as masterworks of evolution – and we could all learn from their energy-saving tricksFeatures
PhysicsThe Renaissance gambler who invented probability to win at cardsJerome Cardano's gambling obsession spurred him to invent two of the most important theories in maths, laying the foundations of quantum physicsFeatures