Charles Darwin joined HMS Beagle when he was just 22 at the request of Captain FitzRoy, who wanted to have a naturalist on board. The ship set sail from Plymouth Sound on 27 December 1831 and returned nearly five years later on 2 October 1836. The journey took Darwin from the Cape de Verde Islands to Mauritius, visiting locations as varied as Brazil, Tierra del Fuego, the Galapagos archipelago, South Africa, New Zealand and the Azores. Darwin's book...