Pumice is the only rock that floats on water.
14
One ragweed plant can release as many as one billion grains of pollen!
51
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
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
According to studies, men change their minds two to three times more often than women.
72
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15