Yawns are more contagious among people with closer relationships.
163
The human body contains over a billion miles of DNA.
147
Enamel is hardest substance in the human body.
61
If you are cold you are more likely to be hungry because you use energy to keep warm.
143
All the chemicals in a human body combined are worth about 6.25 euro (if sold separately).
266
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266