The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The only letter not appearing on the Periodic Table is the letter "J".
180
Most dust particles in your house come from dead skin.
48
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
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