did-you-kno:The Devil’s Kettle waterfalls in Minnesota have one side that pours over a ledge and continues, and another side with a deep hole that vanishes into nowhere. Researchers have poured in dyes, ping pong balls, and logs, but nobody can figure

did-you-kno:The Devil’s Kettle waterfalls in Minnesota have one side that pours over a ledge and continues, and another side with a deep hole that vanishes into nowhere. Researchers have poured in dyes, ping pong balls, and logs, but nobody can figure

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from: https://ciel62.tumblr.com/post/147815141956