You think you know right and wrong? Then can you tell me what wrong is? No, don’t just give me an example. I want to know about wrongness itself, the idea of wrong. What is that idea? What makes something wrong? How do we know that it’s wrong? Maybe you and I disagree. Maybe one of us is wrong about the wrong. Maybe it’s you, maybe it’s me — but we’re not here to trade opinions; everyone’s got an opinion. We are here for knowledge. Our enemy is thoughtlessness. This is philosophy.

Damon Horowitz is asking us the same question that Socrates posed to Euthyphro. What is right and what is wrong? Kant wrestled with that as well and came up with the “categorical imperative” which is mentioned at the end of the talk. If you are wondering what that is read this and if you are really interested read this.