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Sine Wave A 440 Hz Concert Pitch for Ten Hours
Stop your brain from overthinking. You don't need an app. Ten hour Sine wave with no overtones which is called pure as it is only the fundamental frequency.
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In Ghana you can be buried in a conventional coffin or you have one made to your personal likings. We visited Paa Joe north of Accra, he's famous for his creative coffin creatons around the world. When we visited, my favorite coffin was the one of a running shoe and I also liked the chameleon coffin.