Clay on Mars, Neanderthals, Cholera,Tapeworms

Researchers have mapped the genomes of tapeworms to reveal potential drug targets on which existing drugs could act. Tom Koch-discusses John Snow who famously identified a pump as being the source of a cholera outbreak in 1854. NASA has reported that its Curiosity rover has made another significant discovery on Mars and a study of Neanderthal skulls suggests that they became extinct because they had larger eyes than our species.