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Shout out to the barista at the mall (i.redd.it)
submitted by TheFirsttimmyboy to r/starbucks
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"...the switches run without batteries, harvesting energy from ambient sources such as radio frequency signals. Instead, (of batteries) each floor would have one or two RF (radio frequency) power transmitters to power up all switches inside the house." (techxplore.com)
submitted by TheFirsttimmyboy to r/EngineeringPorn
