Cold water weighs more than hot water.
93
Balsa wood is classified as a hard wood!
41
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
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
The average temperature at 40,000 feet above sea level is -60 F.
56
Nearly 50% of the world's scientists are assigned to military projects.
71