Sound travels about 4 times faster in water than in air.
408
A ball of glass will bounce higher than a ball made of rubber.
73
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Each day, up to 150 species of life become extinct.
-23
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
If the chemical sodium is dropped into water it will immediately and violently explode.
67
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199