You can't tickle yourself.
29
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
The human brain uses approximately as much energy as a 10 watt light bulb.
120
By weight, Bone is five times stronger than steel.
417
You forget 90% of your dreams.
256
We share 70% of our DNA with a slug.
218