Scientists often talk of parsimony (as in "the simplest explanation is probably correct," also known as Occam's razor), but we should not get seduced by the apparent elegance of argument from parsimony; this line of reasoning has failed in the past at least as many times as it has succeeded.
Incognito: The Secret Lives of The Brain (ed. Canongate Books, 2011) - ISBN: 9780857860477