Bill Bailey has not just travelled in naturalist Alfred Russell Wallace's footsteps, he's crazy about him too. "I love him, I really do." Wallace is best known for what used to be known as the Wallace-Darwin theory of evolution. When he died in 1913, the New York Times called him the last of the 'giants belonging to that wonderful group of intellectuals ... whose daring investigations revolutionised and evolutionised the thought of the century."