A cubic yard of air weighs about 2 pounds at sea level.
31
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
4.5 pounds of sunlight strike the Earth each day.
27
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
One barrel of petroleum holds 42 gallons.
20