People living in far-flung locations, especially in developing nations, could always use affordable tests for various diseases that enable remote diagnosis. Take for instance, this new two-part biosensing platform developed by a team of scientists from Florida Atlantic University, which can detect E. coli, staph and even HIV with just a drop of the patient's blood. We say "two-part," because it's comprised of (1) a cheap, thin, flexible film and (2) a smartphone app. Each film detects a different disease, which it identifies from the patient's blood. If the bacteria or virus being tested for is present, the blood gets dyed a different color by nanoparticles.