Dune after dune, rising and falling beneath his feet, then finally falling, falling, falling all the way to a gray-green-blue vastness, riffled, glinting, and crossed by the cloud shadows as far as the eye could see.
It was "eye floaters, " microscopic grey globs that cast shadows on the retina, that inspired California Institute of Technology professor Changhuei Yang to create a lensless microscope that aims to change the way scientists go about diagnosing diseases and developing new drugs--for a fraction of the cost.