One 75-watt bulb gives more light than three 25-watt bulbs.
57
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
A cesium atom in an atomic clock beats over nine billion times a second.
43
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
A cubic yard of air weighs about 2 pounds at sea level.
31
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Nylon is made from coal and petroleum.
42
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9