In zero gravity, a candle's flame is round and blue.
16
The average temperature at 40,000 feet above sea level is -60 F.
56
Your brain is 80% water.
525
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
German chemists made a replica of a trophy the size of one molecule.
68
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
