"Good theories of the mind must span at least three different scales of time: slow, for the billions of years in which our brains have survivied; fast, for the fleeting weeks and months of childhood; and in between, the centuries of growth of our ideas through history."

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It was a strange lightness, a drifting feeling. Zero gravity. I understood that everything that once seemed solid and immovable might just float away. And that this was a truth of life, not an illusion in the grieving mind of a child. Everything that is hard and heavy in your world is made up of billions of molecules in constant motion offering the illusion of permanence. But it all tends toward breaking down and falling away. Some things just go more quickly, more surprisingly, than others.

— Lisa Unger