Sound travels about 4 times faster in water than in air.
408
Iron weighs more after it rusts.
68
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
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
The force of a suction cup is calculated using F=AP.
15
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108