Ben Gilbert: electromagnetic signals can be broadcast and travel through space at the speed of light to be received at a different point in the universe. A tiny fraction of these frequencies are detectable by humans as visible light. Some other frequencies can be dangerous like X-rays or gamma rays. But there's a part of the spectrum that is not detectable to humans and it's not harmful at modest doses, he says. He explains how this could transmit invisible messages all around us without any of us having any idea.

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