Are we alone in the universe? Or is the cosmos teeming with life? And what difference would it make if we found the answer? Those are just some of the questions we address in this week's show.

It's one of philosophy's greatest and oldest questions: how should we live our lives? Seeking pleasure? Knowledge? Self-actualization? Is there meaning to be found in this life? Must we create it ourselves?

Consider the now-famous philosophical thought experiment, the trolley problem. An out-of-control train is barrelling into five railroad construction workers, and as an onlooker, you notice a lever that you could pull to divert the train to a track with only one worker. Do you pull the lever? Should you pull the lever?