Pumice is the only rock that floats on water.
14
Cold water weighs more than hot water.
93
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Scientists are working on a portable spray-on-skin that can heal severe wounds in just a few minutes.The spray mainly contains important proteins that can reprogram the injured cells to become stem cells, and back to young uniformed skin cells. So far they were able to accelerate healing process from 12 weeks to 21 days with a similar approach.
16
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51