A Jellyfish Protein Won a Nobel Prize in 2008

Single-celled dinoflagellates flash blue when disturbed, which makes breaking waves and swimmers' movements glow at night.

In the open ocean's deep waters, bioluminescence is so common that a majority of animals are thought to produce light.

Deep-sea anglerfish carry a light-producing lure, and its glow comes from symbiotic bacteria living inside it.

The reaction is extremely efficient and produces almost no heat, which is why the light is often called cold light.