The earth is approx. 6,588,000,000,000,000,000 tons.
175
Your brain is 80% water.
525
A cubic yard of air weighs about 2 pounds at sea level.
31
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The smell of freshly cut grass is actually a plant distress call.
31
Balsa wood is classified as a hard wood!
41
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5