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A study in The New England Journal of Medicine titled "Transient Smartphone 'Blindness'" isn't quite as terrifying as the NYPD's warning about cell phones in bed back in February, but it certainly terrified two women enough to seek medical attention.

The study began with the cases of two women—a 22-year-old and a 40-year-old—who both reported recurring instances of temporary blindness at night that could last up to 15 minutes.

Also a medical concern: getting strangled by your headphones.
Also a medical concern: getting strangled by your headphones.