Some people are entirely convinced that the devices we carry around with us or that are popping up in homes everywhere are surreptitiously activating their microphones and listening to our conversations. It's the only way, they contend, that your Facebook feed could suddenly show you posts regarding the latest kitchen gadget the same night you and a friend talk about the device. Or how Google ads are suddenly showing discounts on car repair after you and a co-worker discussed their recent car … [Read more...] about How Do Our Computers Know So Much About Us?