Oteiza, P.; Köppen, M.; Concha, M. L.; Heisenberg, C.-P.: Origin and shaping of the laterality organ in zebrafish. Development 135 (16), pp. 2807 - 2813 (2008)
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.
