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March 28, 2014 03:16 pm PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/n72fVNzBqKc/story01.htm
The mystery of the fossil spiderfootprints
How scientists figured out that a set of 260 million-year-old footprints were probably made by an arachnid and why those footprints are still shrouded in mystery.Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/n72fVNzBqKc/story01.htm
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