Do you have blue eyes? We talked to experts to discover curious facts about baby blues, including whether your biological family is bigger than you ever imagined.

By keeping the bulb in the center and orbiting the blue gel (for the iris) and the opaque disk (for the pupil) around the bulb, the eye can appear to gaze in different directions. By adjusting the ...

That coloured circle is called the iris and the black spot in the middle is the pupil. This is the part of the eye that lets the ... green and blue, and all the millions of shades in between.