Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
Your body is creating and killing about 2.4 million red blood cells per second.
17
On average, there's 100 billion neurons in the human brain.
83
Enamel is hardest substance in the human body.
61
At age 70, more than 70 percent of men are still potent!
29
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 body is creating and killing 15 million red blood cells per second.
50
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197