Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Iron weighs more after it rusts.
16
In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
17
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
One 75-watt bulb gives more light than three 25-watt bulbs.
57