The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
One cubic foot of gold weighs more than 1,200 pounds!
78
The earth is approx. 6,588,000,000,000,000,000 tons.
175
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Hot water can freeze faster than cold water.
181
Research indicates that plants grow healthier when they are stroked.
173
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21