Genome sequencing can be used to determine whether a patient’s illness is genetic, but it usually takes weeks to get results. A new ultra-rapid technique can sequence a person’s genome and diagnose genetic diseases in just a few hours, earning it a Guinness World Record. All the information that makes up an organism is contained in its genome, including traits like eye color, as well as genetic diseases. By comparing a patient’s genome with a checklist of DNA mutations associated with certain inherited diseases, doctors can diagnose otherwise mysterious illnesses. Currently, this process usually takes a few weeks. But in...