Scientists at the US National Human Genome Research Institute have released a report identifying the bacteria that live on human skin, and it turns out healthy skin is home to a more diverse set of bacteria than previously thought. They decoded the genes of bacteria samples taken from 20 sites on the skin of 10 healthy people and found roughly 1,000 strains of bacteria, hundreds more than have ever been found on skin. These microbes(微生物)are adapted to their habitats, so certain types are regularly found in the moist armpit(脇の下)area while others dwell in dry areas such as the forearm(前腕).