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Canadian study found general population more likely to agree with idea than those affected by disease.
And professionals who work with kids can show more awareness.
Toddlers often test hypotheses, make inferences while having fun, review finds.
U.S. health officials say this year's vaccine protects against two new strains.
Studios including Disney, Universal and Warner Bros. featured more smoking in 2011.
Testing needs to ensure vaccine blocked mother-to-child transmission of virus.
Fruits and vegetables particularly good sources of the substances.
By graduation, many turn to more lucrative specialties.
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