Sound travels about 4 times faster in water than in air.
408
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Most dust particles in your house come from dead skin.
48
Out of all the senses, smell is most closely linked to memory.
146
If the chemical sodium is dropped into water it will immediately and violently explode.
67
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Scientists are now able to grow 'beating' heart tissue in a lab!
162