The podcast episodes provided focus on Charles Darwin and his theory of evolution by natural selection, which he outlined in his book 'On the Origin of Species' published in 1859.

In the first episode, Darwin's Daring Idea with Richard Dawkins, evolutionary biologist Richard Dawkins discusses Darwin's life and work, and how his theory transformed our understanding of the natural world.

The second episode, The Piltdown Man Hoax, examines the Piltdown Man fossil, which was later discovered to be a hoax, and how it was influenced by the pursuit of a 'missing link' in human evolution, a concept popularized by Darwin's theory.