All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
21
If you are cold you are more likely to be hungry because you use energy to keep warm.
143
The human sigh acts as a physiological reset button.
23
The brain receives 20% of the body’s oxygen and 25% of total body glucose utilization, despite it accounting for only 2% of a person’s weight (about 1.4 kilograms).
8
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
The human brain uses approximately as much energy as a 10 watt light bulb.
120
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89