So, for argument's sake, let's say that the universe is made up of a nearly infinite number of planets. If this is the case, then there is a nearly infinite number of ways that each of these planets is structured. Some are giant lumps of rock, some are gaseous balls en route to their self-immolation, and some support life pretty much as we know it.
So if that's the case, then somewhere out there, there is a planet that is quite nearly an exact duplicate of ours. And on this planet, you're sitting there right now in front of your phone, but you're watching a movie instead of reading this page.
And on another planet, I went to bed tonight instead of writing this, so this page doesn't actually exist.
And on yet another planet, none of this has happened because the current state of affairs is a duplicate of Earth as it stood 243 years ago, except everyone has two heads.
Image source: NASA
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