One 75-watt bulb gives more light than three 25-watt bulbs.
57
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
The bark of an older redwood tree is fireproof.
65
Your brain is 80% water.
525
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Nylon is made from coal and petroleum.
42