Google's Pixel 4 and Pixel 4 XL have no fingerprint sensor anywhere, instead relying only on face unlock for biometric authentication. Thanks to the advanced hardware housed in the big top screen bezel, this should theoretically be as secure as Apple's Face ID, but there's one key area in which the two technologies differ. It turns out that the Pixel 4 will unlock even when your eyes are closed. This can become an obvious issue as people around you (a nosy spouse or child or friend) could unlock your phone just by pointing it at your face while you're sleeping. It's unclear why Google has...