"It is this bedrock principle of copyright that mandates the law’s seemingly disparate treatment of facts and factual compilations. “No one may claim originality as to facts.” This is because facts do not owe their origin to an act of authorship. The distinction is one between creation and discovery: The first person to find and report a particular fact has not created the fact; he or she has merely discovered its existence. To borrow from Burrow-Giles, one who discovers a fact is not its “maker” or “originator.” “The discoverer merely finds and records.” Census takers, for example, do not “create” the population figures that emerge from their efforts; in a sense, they copy these figures from the world around them. Census data therefore do not trigger copyright because these data are not “original” in the constitutional sense."