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Health & MedicineNeurons take a break during stage 2 sleep
Electrical markers associated with stage 2 sleep indicate downtime for neurons.
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AnimalsFor some birds, chancy climates mean better singers
In the mockingbird family, the most accomplished musical species tend to live in treacherous climates.
By Susan Milius -
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LifeLife on Earth took a licking, kept on ticking
Earth's early organisms may not have had to restart after a long spell of asteroid impacts.
By Sid Perkins -
Characteristics that help coral bounce back
New report outlines features that make a reef able to deal with environmental stress.