Gestures are one of the smoothest interactions on a smartphone. Though often hidden and only discoverable inadvertently or by trial-and-error, they can save you time once you know how to use them. One of my favorite gestures so far has been the swipe to switch tabs in Chrome, but it may now be dethroned by a new swipe to switch accounts in Google Maps. Though I'll seldom use it in Maps, I'm really crossing fingers that it comes to Gmail soon.

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