Fluid gears rotate without teeth, offering new mechanical flexibility

A team of New York University scientists has created a gear mechanism that relies on fluids to generate rotation. The ...
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The QALO QRNT slim smart ring, reviewed: It's the nudge I needed to finally get off the couch

Both the Oura Ring 4 and the QALO QRNT Slim are made of titanium, are water resistant and track heart health, stress, sleep and exercise/steps. The QALO is a bit thinner (2.2mm vs 2.8mm), costs $150 ...