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An evolutionary burst 540 million years ago filled the seas with an astonishing diversity of animals. The trigger behind that revolution is finally coming into focus.
Songbirds are a culinary delicacy in Cyprus — but catching and eating them is illegal. Even so, the practice is on the rise and could be threatening rare species.
From flocking birds to swarming molecules, physicists are seeking to understand 'active matter' — and looking for a fundamental theory of the living world.