Pumice is the only rock that floats on water.
14
The smell of freshly cut grass is actually a plant distress call.
31
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
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
Scientists aren't sure what color dinosaurs were.
312
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13
4.5 pounds of sunlight strike the Earth each day.
27