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It started in 2010 and was granted a total of 1929 hours of observing time over a five-year period.
ENGADGET: 9-gigapixel image of the Milky Way reminds us just how small we truly are
Observing 25 infants aged 4 to 10 months in a five-day inpatient sleep training program, researchers monitored levels of the stress hormone cortisol in the babies, who were left to cry themselves to sleep without being soothed.
CNN: Should babies be allowed to 'cry it out'?
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