To understand how life works, you need to watch it in action, says bioimaging scientist Gokul Upadhyayula. Taking us down to the cellular level, he shares the work behind cutting-edge microscopes that capture and record, in three dimensions, the complex behaviors of living organisms -- from infecting cancer cells to crawling immune cells -- and what they're revealing about the dynamics of biology. Watch life unfold before your eyes with the incredible visuals in this talk.