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The following are quotes:
- “Contrary to popular belief, being alive is unnatural.”
- — Michael Guillen (1995), Five Equations that Changed the World (pg. 6) 
- Ball, Philip. (2011). Unnatural: the Heretical Idea of Making People (Amz). Vintage Books.
- Guillen, Michael. (1995). Five Equations that Changed the World (pg. 6). Publisher.
- Unnatural – Hmolpedia 2020.