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Seasonal Changes Can Put Teens' Sleep/Wake Cycles Off Track 

SATURDAY, July 31 (HealthDay News) -- When the days grow longer in the spring, teens experience hormonal changes that lead to later bedtimes and associated problems, such as lack of sleep and mood changes, researchers have found.

Athletes Need to Protect Against Heat Stroke: Expert 

SATURDAY, July 31 (HealthDay News) -- Heat cramps, heat exhaustion and potentially fatal heat stroke are risks when exercising or playing sports during the summer, but they can be prevented by taking a few simple precautions, advises a Medical College of Georgia expert.

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Many Horse Lovers Saddle Up Unsafely 

FRIDAY, July 30 (HealthDay News) -- A recent survey highlights the need for a horse rider safety, according to a University of Kentucky expert.

Research Illuminates How the Human Neck Developed 

FRIDAY, July 30 (HealthDay News) -- Because of the freedom of movement it offered, the neck may have been a major contributor to the evolution of the human brain, according to researchers who compared human and fish genetics.

Flu Vaccine for Upcoming Season Approved 

FRIDAY, July 30 (HealthDay News) -- The annual flu vaccine for the 2010-2011 influenza season has been approved by the U.S. Food and Drug Administration, the agency said Friday.