PTELook at the text below. In 35 seconds, you must read this text aloud as naturally and clearly as possible. You have 35 seconds to read aloud.

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Beginning in 35 seconds.

What produce these effects are familiar to neuroscientists : external light and dark signals that help set our daily or circadian rhythms, “ clock ” genes that act as internal timekeepers, and neurons that signal to one another through connections called synapses. But how these factors interact to freshen a brain once we do sleep has remained enigmatic.

PTERead Aloud: #770

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