Technology Review reports on a great combination: metagenomics, the human microbiome, and "a gold mine of feces." Swedish immunologist Bengt Björkstén is starting a metagenomics project on fecal samples to try to determine whether changes in the human microbiome have contributed to the escalating allergy rates in wealthy nations. The article quotes Björkstén as saying, "The key to understanding these diseases may be in the gut, rather than in the environment."