Weekly: Do you really need 8 hours of sleep?; The ancient planet buried inside Earth; Starfish are just heads
#222 At this point, most people have heard the accepted wisdom that you need 8 hours sleep every night, especially for a healthy brain. But what if we’ve got it all wrong? If you lie awake at night worrying about getting enough sleep, you may be in luck. A reminder that correlation is not causation, and some…
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