The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
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
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117