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
A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6
The average human body contains enough iron to make a small nail.
50
Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Kissing an infection-free partner is good for your teeth!
141
2 out of 3 adults in the United States have hemorrhoids.
7