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
Your heart beats over 100,000 times a day!
54
Your thumb is about the same size as your nose.
124
Your heart will pump about 212 million liters in its lifetime.
26
The human brain is insensitive to pain.
76
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193

