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This unbridged gap between the ape-like australopithecines and the abruptly appearing human-like members of our genus challenges evolutionary accounts.

Human brains have decreased in size approximately 3,000 years ago. When and why did the evolutionary changes occur is answered.

Human brains have decreased in size approximately 3,000 years ago. When and why did the evolutionary changes occur is answered.

According to a new study, sleep evolved before brains did. Researchers found this out by studying a small freshwater creature called a hydra that appeared to be in a sleep-like state but has no brain. Jellyfish also appear to sleep and they don’t have a brain either. In a statement, Taichi Q. Itoh, who is an assistant professor at Kyushu University in Japan and an author of the study, stated, “We now have strong evidence that animals must have acquired the need to sleep before acquiring a brain,” adding, “Based on our findings and previous reports regarding jellyfish, we can say that ...

Close Researchers of a new study recently identified a state akin to sleep in a tiny, freshwater animal, also known as "hydra," which has simple anatomy and doesn't have a brain. Such a finding, as reported by Live Science, appears to oppose the common knowledge that the brain needs sleep to function properly. It turns out, based on what the researchers discovered, one does not require a brain to sleep. According to Japan-based Kyushu University assistant professor Taichi Itoh, they currently have "strong evidence that animals must have acquired" the necessity to sleep before they acquired a...