One summer day last July, a six-year-old boy was walking across a dune when he disappeared, falling into a deep, narrow hole in the sand. This and two other holes that have since appeared at Indiana's Mount Baldy are unlike anything scientists have seen before—it could be an entirely new geological phenomenon.
via Gizmodo http://ift.tt/1ivjKkz http://ift.tt/1fqTo8K
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