The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
The bark of an older redwood tree is fireproof.
65
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
Sound travels about 4 times faster in water than in air.
408
Galalith is a type of plastic that can be made from milk. It is odourless, insoluble in water, biodegradable, anti-allergenic, antistatic, and virtually non-flammable.
1
The smell of freshly cut grass is actually a plant distress call.
31