The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
Hot water can freeze faster than cold water.
181
If the chemical sodium is dropped into water it will immediately and violently explode.
67
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Your brain is 80% water.
525
Iron weighs more after it rusts.
16
Nylon is made from coal and petroleum.
42