Enamel is hardest substance in the human body.
61
One human hair can support 3 ounces.
191
Your thumb is about the same size as your nose.
124
Yawns are more contagious among people with closer relationships.
163
Every year your body replaces 98% of your atoms.
119
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
All the chemicals in a human body combined are worth about 6.25 euro (if sold separately).
266
The human brain uses approximately as much energy as a 10 watt light bulb.
120