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An electrician experienced a 14,000-volt shock to his left shoulder that left a unique pattern on his eyes' lenses.
Catra is a cheap clip-on eyepiece and software for smartphones that maps cloudiness in the eye lens like a radar. MIT researchers say it could help many people in developing countries.
We show you how to use two free apps to sync the files on your computer with your phone and let you access it while you're out and about.