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Things You Thought You Knew - Windows to the Universe
StarTalk Radio
The Transparency of Radio Waves
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In cars where they say safety glass, right when the car windshield breaks, it completely shatters into tiny little bits of glass. The worst you need is a bag of band-aids at the end of the broken glass of safety glass. In your microwave oven, you have a metal. So the door is made of glass. Microwave was right through the glass. No problems. But it's not pure glass. Your home is also transparent to largely radio waves. AM has greater penetration through the surroundings of tunnels than FM does.
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