Green eyes are an indicator of Celtic or Germanic ancestry.
Green eyes on women are considered by men to be the most attractive of all the eye colors.
Unlike brown or blue eyes, green eyes don't show up right away in children.
It takes between six months to three years for green eyes to develop.
Both parents with green eyes: 75% chance of baby with green eyes, 25% of baby with blue eyes, ...
People with green eyes have a bit more melanin than people with blue eyes.
In the absence of a lot of melanin, Rayleigh scattering happens.
The green color is from a combination of a blue hue from Rayleigh scattering and "yellow" from the yellow pigment called
The higher the melanin concentration in the iris, the darker the eye color will be.
One reason green eyes are so rare, globally speaking, is because they are a result of harmless genetic mutation.