Iron weighs more after it rusts.
68
Sound travels about 4 times faster in water than in air.
408
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
The average temperature at 40,000 feet above sea level is -60 F.
56