Pumice is the only rock that floats on water.
14
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
One 75-watt bulb gives more light than three 25-watt bulbs.
57
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
If the chemical sodium is dropped into water it will immediately and violently explode.
67
The only letter not appearing on the Periodic Table is the letter "J".
180
Brass doorknobs automatically disinfect themselves in about 8 hours.
18