When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Nuclear power prevented an average of over 1.8 million deaths between 1971-2009 as a result of lower air pollution from reduced coal usage according to NASA.
5
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Iron weighs more after it rusts.
16
Your brain is 80% water.
525