Your brain is 80% water.
525
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
One barrel of petroleum holds 42 gallons.
20
4.5 pounds of sunlight strike the Earth each day.
27
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Sound travels about 4 times faster in water than in air.
408