Perhaps most importantly, Lucy’s discovery foreshadowed a series of fossil finds that filled in the scientific picture of her species. By 1978, enough evidence had accumulated to establish Lucy as the ...

Chief executives have distinctive life cycles—like butterflies and frogs—and each phase has certain qualities worth identifying and paying attention to. That, at least, is the thesis of “The ...

Signs of temporarily delayed tooth development in the skull of an ancient Homo species youth spark debate about the origins of humanlike growth.