"People being able to hack into the car is a big issue, " says Bergquist.

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Bergquist says Facebook takes a 30% cut of the transactions conducted with its Credits virtual currency.

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Also, be a little cautious about letting outdoor pets on the bed, Bergquist said.

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Good vacuuming of the mattress itself is a key line of defense against allergy-causing mites, said Dr. Sharon Horesh Bergquist, assistant professor in the department of medicine at Emory University.

CNN: Meet the critters inside your mattress