Hansen, K.; Schneider, D.; Boppré, M.: Chiral pheromone and reproductive isolation between the Gypsy- and Nun moth. Die Naturwissenschaften 70 (9), pp. 466 - 467 (1983)
Scientists studying a rare population of tool-using chimpanzees have found that aging can have a profound impact on their abilities—but not all chimps decline equally.