The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Scientists in Germany have developed a candy that doesn't cause cavities.
11
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
One ragweed plant can release as many as one billion grains of pollen!
51
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Pumice is the only rock that floats on water.
14