jessica murray
Tuesday, January 17, 2017
update: the intersection of two identical particles moving in completely opposite directions just posted to july 25, 2014.
the intersection of two identical particles moving in completely opposite directions by jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
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