Explorers from Around the World to Mark 125th Anniversary of National Geographic
WASHINGTON, Jan. 10, 2013 -- Have you ever wanted to ask a question of the man who discovered the remains of the Titanic, the primatologist who pioneered field research on wild chimpanzees or the explorer who made the first solo dive to the ocean's deepest point?
You may have read about the "mark test" or "mirror test." It's a way scientists study self-awareness or self-recognition. They surreptitiously put a colored dot or other mark on a subject -- often somewhere on the face. If, while looking in a mirror, subjects touch their marks or adjust their position to see them better, it's clear they understand they're looking at an image of themselves, rather than at other beings. Species that have passed the mark test include all great apes, bottlenose dolphins and magpies.