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How does this necklace help combat the spread of COVID-19?

Answer: By warning you if you’re about to touch your face.

One of the ways the coronavirus spreads is when we touch a surface that has the virus on it and then touch our face, potentially getting the virus into our eyes, nose or mouth. The simple solution to prevent this is not to touch your face; however, most of us have discovered in recent months that it can be a very, very difficult habit to break.

Fortunately, NASA’s Jet Propulsion Laboratory has a solution. The lab has designed a pendant that, when worn as a necklace about 6 inches below your chin, will vibrate to warn you if your hand gets too close to your face. The pendant consists of simple, affordable components housed inside a 3-D-printed shell. NASA has also made all the instructions to create it available for free, in the hopes that it might be refined and widely distributed.

More information, including a link to the open source information needed to make your own, is available on NASA’s website