This seems like a rather mundane question to some, but one everyone needs to have an answer to. It has profound implications politically, sociologically, and religiously. I think it is fair to say that the great majority of us believe all human beings are equal — not necessarily in social status, but fundamentally. The reality is that all people are not treated equally, but this fact is irrelevant to whether or not the should be, and I think we all agree that they should be.
So what it is that makes all human beings equal so that they should be treated equally?