A cubic yard of air weighs about 2 pounds at sea level.
31
The smell of freshly cut grass is actually a plant distress call.
31
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Sound travels fifteen times faster through steel than through air.
134
Your brain is 80% water.
525
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
For every gallon of sea water, you get more than a quarter pound of salt.
45