Images that induce trypophobia, the fear of holes, share visual features with images of certain venomous animals, implying that the aversion has an evolutionary basis. Allie Wilkinson reports -- Read more on ScientificAmerican.com
Gelada baboons use three separate types of yawns, differentiated by the amount of teeth and gums showing, to demonstrate friendliness and aggression -- Read more on ScientificAmerican.com