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When Twinkies hit the stores again on July 15, their shelf life will be nearly twice as long as it used to be: 45 days. (We were surprised it wasn't longer.) There's a whole lot of food science employed to help the creme-filled cake defy the laws of baked-good longevity.

After disappearing when Hostess went into bankruptcy last year, the snack cakes that supposedly last forever are now really going to live on. New owners are bringing them back.