Much as an anthropologist studies populations of people to learn about their environs and social structures, marine microbiologists read the genome of microbes to glean information about the microbes themselves, their environment and lifestyle. Professor Sallie (Penny) W. Chisholm and alumna Maureen Coleman recently found very clear clues about an East-West divide in the lifestyles of two populations of the same bacterium living in the Atlantic and Pacific Oceans. Read a news story.