If driving to a store and waving your phone by a terminal puts too much sweat on your brow, American Express has launched a new way to part with your money in exchange for physical goods that's even more effortless.

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It improved sweat chloride, too, although again, the effects were modest and variable.

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"I like the principle of trusting your instincts - don't sweat the small stuff too much, " she says.

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