• Charles Lyell’s ‘Principles of Geology’ published

  • Thomas Malthus’s ‘An Essay on the Principle of Population’ published

  • Darwin sailed to South America and studied Galapagos Finches and their varying beak size and shape

  • Charles Darwin returned to England from the Galapagos Islands

  • Origin of the Species published by Darwin

  • The Huxley-Wilberforce debate over Darwin’s theory of evolution

  • DNA molecule discovered by James Watson and Francis Crick

  • Scientists modified Darwin’s discoveries of natural selection to include genetics’ effect on adaptations.