The world is full of misunderstood mysteries. As tourists, we visit an ancient ruin, trying to imagine how it once was but not seeing the advanced technology that was used. Or we walk past some dusty pots in a museum but don't realize how they were made. We walk on and get on with the business of the day. Those stones? Surely they were just cut out of a rock, doesn't everyone know that? Those pots? You just bake them in an oven, right? Everyone knows that too, don't they? But then you scratch your head when you learn that in those days there were no hard tools to cut the stones. Nor did ovens already exist to bake those specific pots. You don't get it because everyone says it was figured out a long time ago, right? Books are full of it, right? But man is a herd animal, most don't think very deeply either. That's why the earth was flat, for centuries. That was then, but now we think we are pretty smart, science figures it all out for us. The climate is changing, and carbon dioxide is the culprit, everybody knows that, we are causing this misery ourselves, right? But is it? Or is "carbon dioxide" the new "flat earth" and we follow without much thought what the general belief is? That's why we go out and investigate, uninhibited, and try to follow the trail that previous researchers have taken. And we are then guided by the question "How do you know?" Because all too often, over time, a hypothesis is corrupted into a general truth. And only this key question gets you back on the right track.