"What did falling in love do for you? Can you ever really explain it? It filled empty spaces I never knew were empty. It cured a loneliness I never knew I had. It gave me joy. And freedom. I think that was the most amazing part. I suddenly felt both embraced and freed at the same time."

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Now, almost one hundred years later, it is difficult to fully appreciate how much our picture of the universe has changed in the span of a single human lifetime. As far as the scientific community in 1917 was concerned, the universe was static and eternal, and consisted of a one single galaxy, our Milky Way, surrounded by vast, infinite, dark, and empty space. This is, after all, what you would guess by looking up at the night sky with your eyes, or with a small telescope, and at the time there was little reason to suspect otherwise.

— Lawrence M. Krauss