At the Indian Institute of Science in Bengaluru, researchers have discovered that a pulse of blue light can command human cells to divide — not through brute chemical force, but by coaxing a single enzyme to gather itself into a cluster, which is all the cell needs to begin the ancient choreography of splitting into two. The technique, called LISA, strips cell division down to its philosophical minimum, revealing that the elaborate molecular scaffolding biology has built over millions of years may be less essential than the simple act of bringing the right molecules close together. In doing so