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If it were 1922 you’d be amazed at the latest in wearable technology: a radio in a top hat. Small enough to fit in a large hat, with headphones designed to be worn underneath, sporting one of these radios upon your head was a thrill. Referred to as a “crystal radio,” it was likely powered by nothing more than the radio waves themselves, and was not capable of producing loud sounds. Still, carrying batteries and vacuum tubes in your hat wasn’t bad for one of the first attempts at portable electronics technology.