Iron weighs more after it rusts.
68
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The earth is approx. 6,588,000,000,000,000,000 tons.
175
The only letter not appearing on the Periodic Table is the letter "J".
180
Scientists aren't sure what color dinosaurs were.
312
Cold water weighs more than hot water.
93
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3