Racetrack Playa
A dry lakebed in Death Valley where stones move by themselves, leaving long trails behind them. The puzzle was only solved in 2014: thin sheets of ice push the rocks along under a light wind.
The Bloop
In 1997 hydrophones belonging to the US National Oceanic and Atmospheric Administration recorded an ultra-low-frequency sound in the South Pacific loud enough to be picked up by sensors three thousand miles apart. Its profile resembled a biological one, and for two decades the Bloop was the leading exhibit for anyone who believes in undiscovered giants in the ocean. NOAA settled it in 2012: an icequake, an iceberg fracturing off Antarctica. The sound stopped being a mystery but remains one of the best-known audio files in internet history.
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