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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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Las Pozas (“The Pools”) is a subtropical garden established by twentieth-century British poet Edward James. Soaring out of the Mexican jungle near the town of Xilitla, the gardens are home to enormous concrete works of art that live alongside the tropical landscape.