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
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
Iron weighs more after it rusts.
16