You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19
After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
55
The human sigh acts as a physiological reset button.
23
If you hold farts in during the day, they'll just come out when you sleep.
16
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
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
12
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
The average person's skin weighs twice as much as their brain.
131