BioBots is building 3-D printers unlike any you’ve seen before. Instead of depositing plastic, these machines assemble layers of living tissue. To find out why and how this “organ printer” was developed, Popular Science host Katie Linendoll interviewed BioBots co-founder Danny Cabrera the 2015 Kairos Global Summit.

Popular Science tracked down ground-breaking startups at the Kairos Global Summit. Check out our complete coverage here. You can hear more from Katie on her podcast.