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Oct
7
comment Why is a laserpointer able to “erase” a glow-in-the-dark sticker?
Pics or it didn't happen :)
May
28
comment Proof that the Earth rotates?
Even a football field goal: A tweet from Neil deGrasse Tyson.
Dec
2
awarded  Supporter
Sep
29
asked Calculate the stable height of a balloon
Sep
29
awarded  Autobiographer