Sound travels about 4 times faster in water than in air.
408
Iron weighs more after it rusts.
16
At 15 years old, Jack Andraka invented a method of diagnosing pancreatic cancer, thus helping to save the lives of millions of people around the world. It is 168 times faster, 26,000 times cheaper, 400 times more sensitive, and has a 99% success rate.
15
Galalith is a type of plastic that can be made from milk. It is odourless, insoluble in water, biodegradable, anti-allergenic, antistatic, and virtually non-flammable.
1
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
One cubic foot of gold weighs more than 1,200 pounds!
78