One out of 20 people have an extra rib.
66
The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
You see your nose at all times, your brain just chooses to ignore it.
30
Sex burns about 360 calories per hour.
860
People who sleep late have more mental stamina and can outperform early risers.
33
Flu shots only work about 70% of the time.
18
It takes 17 muscles to smile, 43 to frown.
65
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99