Has anyone ever accused you of acting like you’re the center of the universe? Perhaps when you were 10 years old, upset that your mom wouldn’t take you to buy candy, or when you were so focused on a project that you forgot to congratulate your coworker on a promotion. It happens to the best of us, as most of us are wired to be a little selfish, evolved to survive.

Airlines even tell us to secure our oxygen masks before helping children. But being reprimanded by a friend or parent for being self-obsessed is different from truly feeling like the only person who exists. What if everyone and everything else were just figments of our imagination? What if we are actually the center of the universe? It might seem like a fun 'what if' game to play, but if you ponder it long enough, could it make sense?

Are you sure the phone you’re holding is real? Can you be certain that the person you bought coffee from was indeed there?