One cubic foot of gold weighs more than 1,200 pounds!
78
Sound travels about 4 times faster in water than in air.
408
Billions of neutrinos pass unnoticed through your body every second.
6
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The force of a suction cup is calculated using F=AP.
15
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7