The brain uses over a quarter of the oxygen used by the human body.

                                      Your heart beats around 100, 000 times a day, 36,500, 000 times a year and over a billion times if you live over 30.

                                         The color of a humans skin is determined by the level of pigment melanin have lighr skin while those with large amounts have dark skin.

                                             Infants only blink once or twice a minute while adults blink around 10 times a minute.