Alternative Facts in a Post-Truth World?

Yes, there are facts. We can know some things for sure and we better use our best science to discover as many objective truths as we can. But if that's the truth, then how in the world did we get to this point of radical skepticism and cynicism bordering on nihilism? And what can we do about it? The point of dipping into the dark depths of philosophy is no less than to salvage some grasp on reality....