Your eyes can distinguish more than 10 million colors!
All people with blue eyes can trace their genes back to one individual who lived near the Black Sea nearly 10,000 years ago
Eigengrau is the color you see when your eyes are closed (aka brain gray, or literally translated from German it would be "intrinsic/own gray")
Night vision goggles are green because the human eye can distinguish between more shades of green than any other color
Carrots don't actually improve your eyesight (at least not any more than any other vegetable). This was a lie propagated by the British during World War II because they didn't want the Germans to find out that British pilots were using radar. Instead, they released a public announcement claiming that the reason for their pilot's incredible accuracy was the high number of carrots that they consumed. It was silly, but people believed it.
Some women have a genetic mutation that allows them to see millions of more colors/shades (up to 100 million)