Indoor pollution is 10 times more toxic than outdoor pollution.
62
A ball of glass will bounce higher than a ball made of rubber.
73
The bark of an older redwood tree is fireproof.
65
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
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
The left ear is more responsive to words of love and emotion whispered into it than the right.
40