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Science works by continually testing and revising its theories. Darwin's theories on how evolution works have been no exception. 150 years worth of research has shown that Darwin was right, but have also added new depths of detail to his evolutionary mechanisms.
The Darwin Festival at Cambridge which celebrated 150 years of Natural Selection (and 200 years of Darwin) has released recordings of their talks. These cover many areas from the history of evolutionary biology, the influence of Darwin on ethics and philosophy through to modern advances in our understanding of evolution. You can find them on YouTube or Itunes.