The smell of freshly cut grass is actually a plant distress call.
31
Diamonds can be shattered with a hammer.
-104
A cubic yard of air weighs about 2 pounds at sea level.
31
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
According to studies, men change their minds two to three times more often than women.
72