<p><b>Discover Charles Darwin''s most important ideas...</b><br><br> When the eminent naturalist Charles Darwin returned from South America on board the H.M.S <i>Beagle </i>in 1836, he brought notes and evidence that would form the basis of his landmark theory: that species evolve by a process of natural selection.<br><br> This theory, published as <i>The Origin of Species </i>in 1859, is the basis of modern biology and the concept of biodiversity. It also sparked a fierce scientific, religious and philosophical debate that still rages today.<br><br><b>WITH AN INTRODUCTION BY DARWIN''S GREAT-GREAT-GRANDDAUGHTER, RUTH PADEL</b></p>