When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
One third of the electricity produced on earth is used to power electric light bulbs!
75
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
Most dust particles in your house are made from dead skin!
67
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108