C. difficile diarrhea is largely a nosocomial disease and is the most frequent cause of diarrhea in hospitalized patients. Its occurrence in the outpatient setting, other than in patients confined to nursing homes, is much less common.
Darwin had arrived at a complete theory of evolution by 1839, but it was to be another 20 years before he published his ideas of evolution through natural selection in his epochal book On the Origin of Species by Means of Natural Selection.
Itâs one of my favorite stories in the history of paleoanthropologyâone that involves an anatomist youâve probably never heard of and an infant who was attacked by an eagle and dropped into a hole almost three million years ago. The idea that humans evolved in Africa can be traced to Charles Darwin. In his 1871 book The Descent of Man, Darwin speculated that it was âprobableâ that Africa was the cradle of humans because our two closest living relativesâchimpanzees and gorillasâlive there.