Nobody enjoys giving blood samples, but it’s a necessary part of many hospital stays and doctor visits. Soon we might not have to, thanks to a new device that can isolate biomarkers for different diseases using sound waves, from a single drop of blood, in around an hour.Usually, blood tests involve taking a sample with the dreaded needle in the arm, which is then sent off to a lab to check for certain molecules that can indicate the presence or progression of a disease or condition. But that can...