Space, Earth and the natural world, explained.
Glowing waves, flashing fireflies and deep-sea fish with lanterns all use the same trick: a chemical reaction that makes cold light. Here is how it works and what animals use it for.
Below 200 meters the ocean turns dim, cold and crushing, yet it is full of life. A zone-by-zone guide to the animals scientists have found there and the tricks that keep them alive.
Counting shell rings, reading carbon in a shark's eye and dating coral skeletons: how researchers put ages on animals that outlive any scientist.
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