Clever Halloween Hack Uses Sound Waves to Simulate a Spooky Doodling Ghost

There’s really no wrong way to decorate for Halloween. It’s the effort that counts, even if all you do is toss some pumpkins on the porch, or set up an inflatable witch on the lawn. But there are those that go above and beyond the call of duty, like Dan Beaven, who leverages some cutting-edge levitation tech to make…

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