A four-year-old child will, on average, ask about 437 questions a day.
Women are much more adept at reading backward and identifying hidden 3D drawings thanks to better ties between the two hemispheres of the brain.
In the year 1900, the number of human population was 1.5 million, of whom a quarter lived in Europe.
When two lovers kiss, nerves send signals to the brain at the speed of 128 kilometers per hour.
Cleopatra's Needle, which is now located at Central Park in New York was once part of a sundial.
The human orgasm lasts four minutes on average, while a pig’s orgasm lasts half an hour.
