In 2019, Sebastiaan van Heesch was trying to pry apart the secrets of a broken heart. A systems biologist, van Heesch used a newish method to analyze the contents of ribosomes, cellular protein factories, in a collection of frozen hearts donated by 80 people, many of whom had died from end-stage heart failure. By uncovering all the proteins being produced in each heart, he and his team hoped to learn what had gone wrong. What they found with this “ribosome profiling” tool produced more question...