Many of us access the internet, and the world wide web, via wi-fi. Wi-fi lets us into a fabulous world of shared knowledge and social interaction. On the flip side, it seems that wi-fi can look at us, and perhaps even spy on us. It can even recognize moving humans on the other side of a wall. And this happens by examining not the content of the wi-fi signal, but its strength and timing.

Read more here:: Wi-fi is watching us