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This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?

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"Have you heard of the Affordable Care Act?"

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"Oh yeah, I heard about that…that's the thing that doesn't work?"

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Zach Galifianakis ribbing President Obama in the instant classic viral video.

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But even if Americans have heard of Obamacare, via Zach or more conventional means, many don't know how it works, or even how health insurance works generally.

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Last fall, researchers quizzed 6000 Americans, age 18 to 65, on health insurance and the new law.

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Half didn't know about the insurance marketplaces, or their subsidies.

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Forty-two percent couldn't define a deductible.

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And two thirds didn't know the difference between an HMO, with its restrictive physician network, and a PPO, which typically offers more flexibility.

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The full survey is in the Proceedings of the National Academy of Sciences.

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Study author Silvia Helena Barcellos of USC says those most likely to benefit from the law,

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like uninsured young and low-income respondents, typically know the least.

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"It's very hard to believe that people will make informed choices…without having knowledge of these basic concepts.

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And until we master the basics, she says, simpler insurance options might be just what the doctor ordered.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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