Also known as the "Many-Worlds Theory of Interpretation", this is a philosophical framework for understanding the infinite number of parallel universes that exist in addition to our own.
No, although that would be a great t-shirt idea. In reality, the Many-Worlds Interpretation is more like... well, it's more like "I'm a big fan of probability".
Sorry, no. You're stuck in this reality. But don't worry, you can still explore the infinite possibilities of the multiverse from the comfort of your own couch, while eating Cheetos and playing video games.
Yes! "The Many-Worlds Theory of Interpretation" by "Dr. Reginald P. Bottomsworth" is a great starting point. Or, if you're feeling fancy, try "The Quantum Physics for Dummies" series.
Maybe. Maybe not. But let's be real, your doppelganger is probably just as lost as you are. Maybe they're stuck in a universe where they're a successful accountant.
No. Don't trust anything.