Read More Skeptic Ever since the Enlightenment philosopher David Hume outlined the “Is-Ought” problem—that we cannot derive an ought from an is, or we cannot determine the way something ought to be morally based on the way things are in nature (the classic example being slavery—because ants practice slavery that doesn’t make it natural and therefore acceptable for humans to practice slavery)—people have struggled to figure out on what basis should moral values be grounded. Of course, theists argue that God is that grounding, but what if you don’t believe in God? Is everything relative, including murder? In this article psychologist Gary Whittenberger offers an argument grounded in science and reason for determining objective moral truths.