’ve often read the phrase “my heart skipped a beat” in novels where it was used to describe a giddy, romantic feeling. I understand what authors are going for, but I can’t imagine that your heart actually skipping a beat, or having any kind of irregular rhythm, is a good thing; in fact, atrial fibrillation, an irregular and often rapid heartbeat, affects 1.4 million people in the UK. While it’s possible to wear your 3D printed heartbeat on your finger, and even use 3D printing to create a patch of beating heart cells or a medical model to guide complex valve procedures, it’s hard to get a really good look at the cardiac conduction system, which are the special cells that make our hearts beat. But a team of scientists from multiple universities in Europe are working on a new study, and developed a way to produce 3D data that shows this heartbeat system in extremely specific detail. The results of their work could help surgeons fix hearts without damaging tissue.