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- "I was attracted to science fiction because it was so wide open. I was able to do anything and there were no walls to hem you in and there was no human condition that you were stopped from examining."― Octavia Butler
- "Anecdotal thinking comes naturally; science requires training."― Michael Shermer
- "In a state therefore of great equality and virtue, where pure and simple manners prevailed, the increase of the human species would evidently be much greater than any increase that has been hitherto known."― Thomas Malthus