This isn't the first time biological lasers have come to fruition. Harvard used proteins and kidney tissue for a laser back in 2011, and Michigan itself has worked with chlorophyll and gelatin. However, this latest breakthrough could be particularly helpful for doctors. It'd do a better job of tracking changes in cells or bodily tissues, for one. Surgeons could also use it to spot the very edge of a tumor, helping them remove every last bit of cancer. All told, the blood laser is far from creepy -- that unusual material choice could save lives.