"Childhood is the world of miracle or of magic: it is as if creation rose luminously out of the night, all new and fresh and astonishing. Childhood is over the moment things are no longer astonishing. When the world gives you a feeling of "déjà vu," when you are used to existence, you become an adult."

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In terms of the most astonishing fact about which we know nothing, there is dark matter and dark energy. We don't know what either of them is. Everything we know and love about the universe and all the laws of physics as they apply, apply to four percent of the universe. That's stunning.

— Neil deGrasse Tyson