The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
According to studies, men change their minds two to three times more often than women.
72
Nearly 50% of the world's scientists are assigned to military projects.
71