Touch interfaces are cool and easy to use, but we don't really notice just how much of these gestures are often "two-hand-centric" until the time comes when you're forced to use it single handed. Maybe you're walking down the street, keeping your smartphone on one hand, and a bag of groceries on the other, and you decide you want to find out where that spot was on Google Map. Zooming in and out using the pinch to zoom suddenly doesn't sound as friendly when you have just one hand to hold the smartphone and do it.
But actually... you don't need to. You can zoom in/out in Google Maps using a single finger. You just need to double tap the screen and keep your finger (most likely your thumb) pressed against the screen on the second tap. Then, you can easily zoom in/out by simply moving your finger up or down.
Quite a clever way to do it single-handed, and that will surely come in handy next time you're out on the street holding an umbrella on a rainy day, and your smartphone/maps on the other.
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