The universe is 13.8 billion years old with a very small uncertainty of just tens of millions of years, which is big by human standards. The cosmic microwave background radiation, this little beach ball in the background, that's actually the oldest light in the universe. So that's kind of a God's-eye view of what you'd see if you could look down in our universe from some omniscient deities perspective. And we can date those photons just like you can date carbon date or you can date tree rings on trees to get their age. You don't just take one- Are you saying I'm old again? Well, I have a good quote for you. When an elderly

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