The smell of freshly cut grass is actually a plant distress call.
31
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Scientists aren't sure what color dinosaurs were.
312
Most liquid laundry detergents are alive with living organisms that help to break down stains!
88
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
For every gallon of sea water, you get more than a quarter pound of salt.
45
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79