VPNs encrypt your traffic, but they aren't blind to your activity. Here's the metadata your provider can see—and how to spot services that misuse it.

The Stelo is available to anyone who wants to monitor their blood glucose, no prescription needed. But as an active adult without diabetes, are these extra data points worth $99 per month?

Neutrinos live in a lonely universe. Every second, millions of them pass through our planet, but they so rarely interact with other matter that they don’t leave much of a trace. The highest-energy of ...