In biological engineering, scientists imitate nature. Nearly all scientific efforts to control human health, the environment, and agriculture appropriate evolutionary processes — such as technologies that recombine DNA or, more recently, edit the genome. Using beneficial microbes holds promise for public health and food production, too. But has trade-offs that are not yet fully understood. Read more about it in the January-February 2017 issue of American Scientist, which is also online. American Scientist is published by Sigma Xi — The Scientific Research Honor Society.