When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
One barrel of petroleum holds 42 gallons.
20
Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
9
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9