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</html><thumbnail_url>https://world.edu/wp-content/uploads/2017/08/Startseite-ETS-final.png</thumbnail_url><thumbnail_width>680</thumbnail_width><thumbnail_height>240</thumbnail_height><description>How do you know what the weather will be like tomorrow? How do you know how old the Universe is? How do you know if you are thinking rationally? These and other questions of the &#x201C;how do you know?&#x201D; variety are the business of epistemology, the area of philosophy concerned with understanding the nature of [&hellip;]</description></oembed>
