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Which of these is not possible with a smartphone?

The correct answer is
`X-ray vision´.

There is currently no app that can give you X-ray vision – besides, the safety concerns of high intensity radiation would prove a major barrier in making this a reality. Seeing through walls may not be possible but seeing around corners and measuring brainwaves can both be done with a smartphone.

500,000 apps and counting.
Thank physics for that.

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