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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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The Medici Makers of Modern Art
Youtube
The House of Medici was an Italian banking family and political dynasty that first began to gather prominence under Cosimo de' Medici in the Republic of Florence during the first half of the 15th century. The Medici are among the most renowned art patrons in history, and with good reason. But here's a fascinating thing: they are also among the architects of the modern economy. They were the greatest bankers of their age, and the Medici bank pioneered crucial aspects of modern finance. They were "foreign exchange dealers" who enacted a "transfiguration of finance", points out the financial historian Niall Ferguson. When we look at Botticelli's Venus, we are looking at money. A documentary by BBC.