Following is a transcript of your video. Why do football players wear black stripes under their eyes? It's a phenomenon called "eye black." Natural skin absorbs some light, but reflects the rest.

People with brown or black eyes are often seen as "born leaders ... and less sociable compared to their peers with dark irises. And what about people with gray eyes? According to studies ...

Eyes have a dark iris, but the pupil is still discernible. Colouration is highly variable, ranging from black, brown, grey, and olive with either no pattern or orange, yellow or grey bands on the ...