This conversation is about the history of life and earth. I speak with evolutionary biologist and author Olivia Judson, who is best known for her book 'Dr. Tatiana's sex advice to all creation''. Oliva thinks of the history of life on earth in terms of 5 energy epochs, in which life has worked out how to make use of different kinds of energy. These epochs are geochemistry, light, oxygen, flesh, and fire. Olivia explains her fascination with the transformation of life over time, and with what it means to be alive 4.5 billion years into earth's history. Olivia is currently in the final stages of authoring her next popular science book on just this topic.