Sound travels fifteen times faster through steel than through air.
134
Pure water (H2O) does not conduct electricity on its own.
46
Iron weighs more after it rusts.
68
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
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
Your brain is 80% water.
525
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15