Iron weighs more after it rusts.
16
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
17
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39