Déjà vu occurs when your brain tries to apply a memory of a past situation to your current one, fails, and makes you feel like it's happened.
12
Passengers on the Beijing subway can pay with plastic bottles.
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The WD in WD-40 stands for Water Displacer.
30
Sunflowers can be used to clean up radioactive waste.
17
On average, 100 people choke to death on ballpoint pens every year.
72
The chlorine smell in swimming pools is accentuated by the chemical's reaction with impurities (like poop.)
7
New York's Central Park is nearly twice the size of the entire country of Monaco.
42