Scientists aren't sure what color dinosaurs were.
312
The smell of freshly cut grass is actually a plant distress call.
31
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
One ragweed plant can release as many as one billion grains of pollen!
51
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79