When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
The average temperature at 40,000 feet above sea level is -60 F.
56
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
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
German chemists made a replica of a trophy the size of one molecule.
68
4.5 pounds of sunlight strike the Earth each day.
27