Josiah Zayner is a biohacker who’s famous for, among other things, injecting himself with the gene-editing tool CRISPR. At a time when the technology exists for us to change, or hack, our own DNA, what are the ethics of experimenting on ourselves, and others at home? Arielle Duhaime-Ross has been following Zayner’s story and talks to him about how he’s thinking about human experimentation today. Plus: new efforts to come up with a code of conduct for biohackers, from legislation to self-regulation.