When worlds collide

BBC: It was the biggest event in our planet's history since the extinction of the dinosaurs. Three million years ago, the Americas collided. The creation of the Panama Isthmus - the narrow land bridge that joins the two continents - wreaked havoc on land, sea and air. It triggered extinctions, diverted ocean currents and transformed climate. Now a multi-billion dollar project to widen the Panama Canal is set to reveal new secrets about the event that changed the ......

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