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
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
On average, there's 100 billion neurons in the human brain.
83
Redheads require more anesthesia to 'go under' than other hair colors do.
50
The human brain doesn't stop developing until about 25 years old.
102
One or two alcohol drinks a day can be anti-inflammatory.
75
Pain travels through your body at 350 ft. per second.
36