Astrocytes are more involved in cognition than researchers realized, at least when it comes to fear memory retrieval and extinction. Experiments in mice show that astrocytes dynamically track emotional state and help organize the neural activity patterns that represent fear.

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To Horvath, these pushes toward screens in classrooms was an attempt to solve a problem that did not exist. At the turn of the century, achievement gaps across race and gender were closing, and test scores were rising, he said.

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"I believe we've had a problem here," said Swigert. Lovell had to repeat the message to a stunned Mission Control: "Houston, we've had a problem."

This time they proved that man could work outside a spacecraft. Aldrin clambered awkwardly into the void, spending five hours photographing star fields.

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