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From the Introduction:From the skies above us to the deepest oceans, our world is full of twinkling, flashing, blinking and glowing lights. Whether it is the gentle dance of fireflies in the air or the explosion of colours and patterns in the deep sea, this light show is the silent language of remarkable creatures.“Bio” means life or living; “luminescence” means light. Creatures that can produce this living light are called bioluminescent. Scientists believe this ability evolved separately in as many as 100 different organisms. They think this happened over and over again because it is such a useful tool for survival.While several kinds of creatures that live on land can create their own light, most of the bioluminescent creatures live in the sea.