The wrist bands were conspicuous by their absence in the second half.
Combined with a water-based attractant derived from human sweat (collected from a wrist band), the trap mimics the scent, moisture, and temperature profile of a sleeping body.
People have tried different ways to prevent the condition, including wrist bands and anti-nausea drugs.
They fitted 495 people aged 35 to 47 with sophisticated wrist bands that tracked subtle body movements.
Some warehouse workers already wear wrist bands or headsets that measure their productivity and location in real-time.
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