The answer is: Norovirus .
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Pediatricians cover the largest range of ailments
Answer: In one study, exercise stimulated the human brain's ability to maintain old network connections and make new ones that are vital to cognitive health. Other studies have shown that exercise increased the size of a brain structure important to memory and learning, improving spatial memory.
Answer:
For one teens get addicted mostly through peer-pressure and two the brain becomes confused with whats wrong and whats right once you start and can't quit.
