DrDeath started a good thread with "What is a sin?" and that inspired me to ask "What is a right?". In the USA we have the famous Bill of Rights, and Europe and the UN have their Declarations of Human Rights. And the philosophes in France and the founders in the US believed that there were inherent rights of human beings. But modern thinkers are not so sure. How do rights come out of evolution? Hume would have said they couldn't; no combination of statements of the form "X is so" can ever amount to a proof that "X ought to be so". So what do the PFers think?