Scientist Quotes and aphorisms about birth S. Jay Olshansky ,, While eliminating smallpox and curtailing cholera added decades of life to vast populations, cures ... Zeresenay Alemseged ,, At age three, if you have a still-growing brain, it's a human behavior. In chimps, by age three, th... Marvin Harris Sydney Brenner Desmond Morris Arthur Keith Bernard Katz James Bryant Conant Steven Weinberg Manfred Eigen