When you want to edit someone’s DNA,  you need a set of molecular scissors. That’s where CRISPR comes in. This highly specialized technique can find a specific point on the genome, snip it in two, and splice in a string of new code. Now researchers are looking into how this method can be applied to the health of our microbiome, and what the good bacteria in our bodies can do to keep us healthy. It’s all about engineering the microbiome to better understand how it affects our well being.