Balsa wood is classified as a hard wood!
41
Sound at the right vibration can bore holes through a solid object.
134
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Pure water (H2O) does not conduct electricity on its own.
46
According to studies, men change their minds two to three times more often than women.
72