Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
It takes approximately 12 hours for food to entirely digest.
93
Human teeth are almost as hard as rocks!
47
Every cigarette smoked cuts at least five minutes of life on average, which is roughly the time it takes to smoke one cigarette.
118
The lense of the eye continues to grow throughout a person's life.
34
People who sleep late have more mental stamina and can outperform early risers.
33
Your skeleton keeps growing until you are about 35, then you start to shrink.
74
About half of all Americans are on a diet on any given day.
29