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A study of an ancient fish fossil has provided fresh insights into the evolution of vertebrates’ skulls. The 455-million-year-old skull fossil belonged to a jawless fish called Eriptychius americanus.
A large group of yellowfin tuna swimming off the coast of Italy. Like all fish, they sleep, but it's not like human sleep. Giordano Cipriani/The Image Bank via Getty Images Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. Could you explain how fish sleep? Do they drift away on currents, or do they anchor themselves to a particular location when they sleep? – Laure and Neeraj, New York From the