My condolences go out to the family. Even though the article states that the girl boarded the ride healthy,in some cases a person can have something wrong with them and not even know it (like what Jeff stated about basketball players who suddenly collapse and die on the court, for example).
Though not related to the story but within the same topic, how many people really pay attention to the fun and safety signs at ride entrances? If someone with a medical condition wants to conquer the biggest and most intense coaster in the park, more than likely they'll get in line without looking at the safety signs.
X Factor
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SFWoA: An Unofficial Guide
http://sfohio.tripod.com