Oh great, more surveillance!

A team of Penn State computer scientists has cooked up a chilling new way to eavesdrop: detecting the microscopic vibrations your smartphone gives off during a call and translating them into words using artificial intelligence.

The method relies on millimeter-wave radar, the same high-frequency tech powering self-driving car sensors, motion detectors, and 5G networks. Aim it at a phone and it can capture the subtle tremors from the earpiece when someone is speaking. These vibrations are invisible to the naked eye but, with the right tools, can become a transcript of your conversation.