It’s lucky you’re here 13.7 billion years ago, the universe was born in a cosmic f ireball. Roughly 10 billion years later, the planet we call Earth gave birth to life, which eventually led to you. The probability of that sequence of events is absolutely minuscule, and yet it still happened. Take a step back from the unlikeliness of your own personal existence and things get even more mind-boggling. Why does the universe exist at all? Why is it f ine-tuned to human life? Why does it seem to be telling us that there are other universes out there, even other yous? Confronting these mysteries of existence can lead to bizarre conclusions, from the possibility that the universe is a hologram to the near-certainty that you are a zombie. Enjoy the ride.
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