We will explore the ultimate nature of reality in general, and of us in particular. Here are some of the questions we will discuss: Why is there anything at all? Are we free? Are we entirely material? Are there numbers? Is there a sense in which time genuinely passes? Is time travel possible? Are ordinary things like tables spread out in time like they are in space? And are metaphysical questions defective in some way? We'll find that the more we think about these questions, the more perplexing things seem.