Meet Kenneth Shinozuka.

All GIFs via NBC News and Google Science Fair.


He lives with his grandpa. They're really close.

Unfortunately, Kenneth's beloved grandpa suffers from Alzheimer's disease.

Within a few years of being diagnosed, his grandfather started getting up in the middle of the night and wandering off — once even onto the freeway. He and his family were woken up when a police officer brought him back (safe, thankfully!).

"It was very real and very scary," Kenneth said in an NBC interview.

Kenneth wanted to find a way to keep his grandpa safe. So he invented something awesome.

...a simple sensor that attaches to a sock and alerts a caregiver's smartphone if the wearer wanders out of bed.

Kenneth's invention is so good, it won him a Science in Action award from Scientific American.

The sensors are now being tested by patients in a nursing home, with some impressive results.

This isn't just a win for Kenneth and his grandpa. Over 5 million Americans have Alzheimer's.

Roughly 60% of these folks will, at one time or another, wander off.

Kenneth's simple sock device can keep so many of our loved ones safe.

Not too shabby for a 15-year-old.

For full dose of heartwarming goodness, check out the video:

And here's a little more info on Kenneth's invention:

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