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Karl Popper is one of the most significant philosophers of the 20th Century, whose ideas about science and politics robustly challenged the accepted ideas of the day. He strongly resisted the prevailing empiricist consensus that scientists` theories could be proved true. He believed that even when a scientific principle had been successfully and repeatedly tested, it was not necessarily true. Instead it had simply not proved false, yet! This became known as the theory of falsification. He called for a clear demarcation between good science, in which theories are constantly challenged, and what he called ?pseudo sciences? which couldn`t be tested. His debunking of such ideologies led some to describe him as the ?murderer of Freud and Marx?. So how did Karl Popper change our approach to the philosophy of science? How have scientists and philosophers made use of his ideas? And how are his theories viewed today? Are we any closer to proving scientific principles are ?true??