When is the truth the truth, a lie a lie, and what constitutes mere BS in an era that many refer to as “post-truth”? We address the kinds of critical and largely ethical questions we confront in our modern-day discourse across this deep dive, exploring the intent of the First Amendment (does it protect lies?), the reasons we lie (or, in fact, are we just strategically misleading?), and, through the lens of a lawyer, a fact checker, and a scientist, the ways various of us define and “get to” the truth.