Indoor pollution is 10 times more toxic than outdoor pollution.
62
One cubic foot of gold weighs more than 1,200 pounds!
78
The use of emoticons affects our corresponding brain areas and can actually trigger emotions.
21
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
A cubic yard of air weighs about 2 pounds at sea level.
31
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116