Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Hot water can freeze faster than cold water.
181
The average temperature at 40,000 feet above sea level is -60 F.
56
4.5 pounds of sunlight strike the Earth each day.
27
Diamonds can be shattered with a hammer.
-104
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75