We don't often think of modern American communities as places that disappear. But lead pollution erased the tiny Texas community of Smeltertown from the map. And Smeltertown isn't alone. Across America we've scraped ...

From skinny sea lions on beaches in California, to hundreds of enormous dead whales in the fjords of Chile, scientists have been recently puzzled by a spate of dead and dying marine mammals. These events are so complicated- ...