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
By weight, Bone is five times stronger than steel.
417
Children are more allergic to cockroaches than they are to cats!
46
The pupil of the eye expands as much as 45 percent when a person looks at something pleasing.
130
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Your wounds heal faster if you lick them, you instinctively do this for that reason. Tears help, too.
20
The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
112