No, this isn't one of your childhood sci-fi dreams brought to life -- it's real. University of Michigan researchers have developed a medical observation laser where human blood is a key ingredient. When the team shined a laser into a small cavity full of dye-infused blood, they discovered that they could process the laser's light according to their needs. They could amplify the light to exaggerate small changes in cell activity, or filter it to reduce background noise. Existing techniques combine dyes with infrared or visible light in a way that makes it difficult to spot tiny differences.