The Manchineel Tree is so poisonous, rainwater dripping off it’s leaves will burn your skin.
17
Iron weighs more after it rusts.
16
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75