Sound travels fifteen times faster through steel than through air.
134
Balsa wood is classified as a hard wood!
41
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
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 average home creates more pollution than does the average car.
33
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Most dust particles in your house come from dead skin.
48