The Cala Trio is a wrist-worn biolectronic device that treats essential tremor. Years ago, Kate Rosenbluth, PhD, watched as a neurosurgeon delivered the news to one of his patients that a pre-existing ...

We may earn a commission from links on this page. One of the most common first sensors people buy for their home is a motion sensor. But in almost all cases, you want a presence sensor instead. The ...