An Entire River in Canada Has Vanished in the Space of Just 4 Days

For the first time in modern history, scientists have observed an entire river disappear in the space of days.

The phenomenon – called river piracy – is where one river's flow is captured by another. Historical evidence suggests it usually takes thousands of years for the process to occur, but in this case the Slims River fed by Canada's Kaskawulsh Glacier was co-opted in only four days – a timeframe researchers describe as"geologically instantaneous and… likely to be permanent".