When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The bark of an older redwood tree is fireproof.
65
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
German chemists made a replica of a trophy the size of one molecule.
68
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Liquid TIDE laundry detergent glows under a blacklight.
96