Box jellyfish have no brains, yet were recently found to be able to learn from touch. Many brainless organisms are now forcing us to rethink what it means to learn.
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Researchers have long suspected that an ingredient in sunscreen called oxybenzone was harming corals, but no one knew how. A new study shows how corals turn oxybenzone into a sunlight-activated toxin.
Four organisms that show nature isn’t so easily categorised.


