Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Iron weighs more after it rusts.
16
Balsa wood is classified as a hard wood!
41
One cubic foot of gold weighs more than 1,200 pounds!
78
Each day, up to 150 species of life become extinct.
-23
The only letter not appearing on the Periodic Table is the letter "J".
180