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Yale has made its most popular class available online for free

It's a privileged few who get the chance to study at a top Ivy League university like Yale. Its esteemed alumni include Bill and Hillary Clinton, George Bush Snr (and Jnr), actors Meryl Streep and Jodie Foster, CNN anchor Anderson Cooper, PepsiCo CEO Indra Nooyi, and the first female head of the Federal Reserve Janet Yellen, to name just a handful.