A family recently came into my office and dumped a foot-high stack of papers on my desk. These, they explained, were pages they had printed from the World Wide Web that provided information on their child's rare genetic disease. What did I, a doctor and expert in the field, make of the reports? That night I spent eight hours reading through the pile, trying to separate quackery from relevant information. During that long evening, I also realized the extent of the difficulties ever more people face when they are trying to make important decisions about health care options.

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