Do you have big eyes? Apparently monkeys are really into them. A recent study at the University of Bremen, Germany has found that macaque monkeys have the most brain cell attention focused on the size of the iris of different faces. The more extreme the iris size, the bigger the reaction of the brain cells. There were also 19 other features of the face that different brain cells responded to, but the cells dedicated to eye size were the most numerous. I guess this explains MRirian's huge macaque monkey following on YouTube. [Scientific American]