Published in 1872, The Expression of the Emotions in Man and Animals was a book at the very heart of Darwin's research interests - a central pillar of his 'human' series. This book engaged some of the hardest questions in the evolution debate, and it showed the ever-cautious Darwin at his boldest. If Darwin had one goal with Expression, it was to demonstrate the power of his theories for explaining the origin of our most cherished human qualities: morality and intellect. As Darwin explained, "He who admits, on general grounds, that the structure and habits of all animals have been gradually evolved, will look at the whole subject of Expression in a new and interesting light."
Charles Darwin was born in Shrewsbury in 1809 and was educated at Shrewsbury School, Edinburgh University and Christ's College Cambridge. He took his degree in 1831 and in the same year embarked on a five-year voyage on HMS Beagle as a companion to the captain; the purpose of the voyage was to chart the coasts of Patagonia and Tierra del Fuego, and to carry a chain of chronometric readings round the world.
While he was away some of his letters on scientific matters were privately published, and on his return he at once took his place among the leading men of science. In 1839 he was elected a Fellow of the Royal Society. Most of the rest of his life was occupied in publishing the findings of the voyage and in documenting his theory of the transmutation of species. On the origin of species by means of natural selection appeared in 1859.
Darwin spent many years with his wife - his cousin Emma Wedgwood, whom he had married in 1839 - and their children at Down House in Kent. He died in 1882, and was buried in Westminster Abbey.