On average, a person who smokes a pack of cigarettes a day will lose two teeth every 10 years.
It is possible for a giraffe to clean its ears with its tongue, which is on average 21 inches long.
The average person needs seven minutes to fall asleep.
A lightning bolt contains so much energy that it can momentarily heat the air around it to over three times the temperature of the sun’s surface.
For every shark that attacks a human, people kill about a million sharks.
Falling space dust causes the Earth to get 100 tons heavier every day.
Albert Einstein didn’t speak before the age of four.
All clams are born as males. Some become females at some point in their lives.
The sun shrinks five feet every hour, which adds up to about 0.1 percent per century.
Fingernails grow nearly four times faster than toenails. Nails grow fastest on your middle finger, and slowest on your thumb.
At –90°C, your breath would crystallize in midair and fall to the ground.
Goosebumps serve no biological function, although they might have for our hairy ancestors. Small muscles raise the hair on a mammal’s arms and legs to trap warm air and prevent heat loss, which doesn’t work for humans due to our lack of excessive hair.