0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
The force of a suction cup is calculated using F=AP.
15
A cubic yard of air weighs about 2 pounds at sea level.
31
According to studies, men change their minds two to three times more often than women.
72
A ball of glass will bounce higher than a ball made of rubber.
73
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
One cubic foot of gold weighs more than 1,200 pounds!
78
Iron weighs more after it rusts.
68