Immunity to sleep deprivation
No, they’re not vampires, but people with a mutation of the DEC2 gene can fall short on sleep yet feel fine. For the 1 percent of the population with this mutation, around six hours a night is fine—an amount that after a few nights would wreck most people. Those with the condition are called familial natural short sleepers (FNSS), and experts believe that some famous people, such as Margaret Thatcher and Winston Churchill, may have had it.
Advanced color vision
The average eye has three cones, which means you can recognize colors in the red, green, and blue spectrums. This means you can distinguish roughly a million different shades, according to the BBC. However, there are so-called tetrachromats who walk among us and have four cones in their eyes. They can see ultraviolet shades, allowing them to appreciate 100 million distinct colors. The rare vision anomaly is more common in women than men, and a lot of people don’t even realize they have it. Don’t miss these 20 obscure facts you never knew about the human body.