This tree trunk has been floating upright for 120 years – and no one knows why

Crater Lake in Oregon is the deepest lake in the United States, and its water is so blue, you’d be forgiven for thinking someone slipped a few gallons of food colouring into it. But its sheer size and brilliant blue water aren’t the only distinguishing features of Crater Lake – there’s a 9-metre-tall (30-foot) tree stump that’s been bobbing vertically in the lake since at least 1896, and it’s buoyant enough to support the weight of an entire person standing on top. First discovered in 1896 by geologist and explorer…

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