Darwin remains the paramount figure in biology. His Theory of Evolution based on natural selection and his concept of the Tree of Life have become central tenets of biology. Evolution is the overarching theory of biology without which we cannot explain either how we have been breeding plants and animals, or how microbes and pests acquire resistance against medicines and pesticides. This episode features Darwin, his work and the work of his Islamic predecessors.

Horizons is produced by Bibliotheca Alexandrina, and featured on ACMi with permission from Dr. Ismail Serageldin.