Turns out it's a thing of great beauty and high performance: available in porcelain enamel in every color with brass or nickel handles and renowned for a "Top Chef"-esteemed combo of side-by-side electric and gas ovens for both dry and moist heat.

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Dr Lackner's version uses layers of Teflon or paper covered with a resin that absorbs carbon dioxide when dry and gives it up when moist.

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Tornadoes are most likely when exceptionally cold, dry air plunges south to violently clash with warm, moist air originating in the Gulf of Mexico.

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For example, your doctor may recommend that you suck on a piece of sugar-free candy or chew sugar-free gum to relieve dry mouth, and use eyedrops to keep your eyes moist.

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