The average temperature at 40,000 feet above sea level is -60 F.
56
Iron weighs more after it rusts.
16
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
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Dr.Jonas Salk, the man who came up with the cure for polio, didn’t patent the drug. This made the drug more affordable to the general public, and he lost out an an estimated $7 billion dollars for himself.
41
Nylon is made from coal and petroleum.
42
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310