This bright clump of worms resembles the wild snakes that surrounded the head of the mythological sea monster Medusa. But unlike Medusa's snakes, these worms became sticky and connected during an experiment designed to understand how molecules determine cell and organism size. C. elegans worms have a transparent nature that makes them ideal for fluorescence microscopy. This single image captures all levels of the central dogma of biology: DNA (stained in blue) and pre-processed ribosomal RNA (stained in red), while the worms are a transgenic line with fib1::gfp protein (in green).