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Changes to Step #13

Edit by Sam Goldheart —

Edit approved by Sam Goldheart

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[* black] Time for some Science with iFixit!
[* black] Just how does the Fire Phone know where your face is in relation to the phone and create that fancy 3D effect?
[* black] There are four [http://en.wikipedia.org/wiki/Infrared|IR] projectors, one near each corner of the phone. They're blasting you with invisible (to the human eye) infrared rays any time you're staring at the phone while the display is on.
[* black] There are also four IR cameras capturing this information—one at every corner of the phone.
-[* black] The Fire Phone ~~triangulates~~ rectangulates your position, figures out that there's a human face looking at the display, and starts working its wonderful juju magic — all in real time.
+[* black] The Fire Phone ~~triangulates~~ rectangulates your position, figures out that there's a human face looking at the display, and starts working its wonderful juju magic—all in real time.