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Meet 2 students who earned perfect score on AP calculus exam

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Massachusetts mom runs 7 marathons on 7 continents in a week

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Pushing the Limits: Skyrunning

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Pushing the Limits: Hyperloop transportation system

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Pushing the Limits: Swimmer Katie Ledecky makes history

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From the family farm to off-road racing glory, California man shows there are no limits in life

CBS Mornings