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#14 You can turn your phone into a stealthy TV-B-Gone
This is one I can't wait to try out. Down here in Central Florida, if a TV is on and blaring in a doctor's office, restaurant, or other public place, it's either blaring a soap opera, some very-not-mainstream religious programming, or some very off-brand home shopping channel. Florida is a strange place.
Now, it can look like you're playing with your phone, but you can power off almost any TV. It might not be the most well-behaved use of your phone, but you'd be doing a public service.
Image courtesy TV Off.
#15 The thing senses hand gestures above it
Imagine you've just sat yourself down to a wonderful, messy, sticky plate of ribs, and you want to read the latest post by our very own Jason Perlow. If you had an iPhone, you'd have to slather the screen with sticky sauce to scroll the page.
On the other hand, since my new Android phone senses gestures without requiring physical contact, if you had your own Galaxy S4, you'd be able to simply wave your hand (without touching the device) and still be able to control it.
See? Now you can have your ribs and read it, too!
Image courtesy Flickr user jasonperlow (yep, the one and the same). It makes me wimper just looking at these pictures.
#16 It watches your eyes
The Galaxy S4 will track your eyes. This opens up the door to all sorts of interesting applications, like rotation tracking, where it knows what angle you're reading the phone at. I do a lot of reading in bed, with my head down and at an angle, and I've always had to engage the rotation lock to keep the screen from getting all wonky. This solves that problem.
At a more novelty level, the phone will also stay on as long as you're looking at it, will scroll web pages when you look down on the page, and pause video playback if you look away (which I'm thinking may lead to all sorts of psychological disorders if used too much).
While these are certainly not make-or-break features, they're part of what make the Galaxy S4 seem modern and current and the iPhone 5 seem so terribly dated.
Image courtesy my Galaxy S4.