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Strange but true: A vigorous foot massage is one of the simplest short-term solutions to jet lag. And since no one wants to fit yet another gadget in their carry-on, we'jre going low-tech with our choice of the Soothera wooden ball foot massager. The real bonus here is the set of slippers that come with it, which contain within their lining thousands of thermal gel beads that can be heated or chilled, depending on whether one wants to reduce swelling or increase circulation after a long flight

It's ubiquitous. It's universal. And it's understood—not! Water's choices in a given situation often defy scientific predictions.