NOVA 43x14 - Creatures of Light

On a summer's night, there's nothing more magic than watchingthe soft glow of fireflies switching on and off. Few other lifeforms on land can light up the night, but in the dark depthsof the oceans, it's a different story: nearly 90% of allspecies shine from within. Whether it's to scare offpredators, fish for prey, or lure a mate, the language oflight is everywhere in the ocean depths, and scientists arefinally starting to decode it. NOVA and National Geographictake a dazzling dive to this hidden undersea world where mostcreatures flash, sparkle, shimmer, or simply glow. Join deepsea scientists who investigate these stunning displays anddiscover surprising ways to harness nature's light-fromtracking cancer cells to detecting pollution, lighting upcities, and even illuminating the inner workings of ourbrains.