If you were to roll a lung from a human body and out flat it would be the size of a tennis court.
36
The human brain is insensitive to pain.
76
When you get goosebumps and your hair stands, the hair helps to trap air, making you feel warmer by keeping in your body heat.
46
When your face blushes, the lining of your stomach turns red, too.
154
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
People who sleep late have more mental stamina and can outperform early risers.
33


