Caltech Commencement Address http://commencement.caltech.edu/archive/speakers/2012_address - 2012 
 Quotes https://www.wewishes.com/elon-musk-quotes/, Conversation: Elon Musk on Wired Science (2007), Foreword to Marc Kaufman's  Mars Up Close: Inside the Curiosity Mission https://books.google.com/books/about/Mars_Up_Close.html?id=o6XaCwAAQBAJ&hl=en. National Geographic. ISBN 978-1-4262-1278-9.
                                    
“Imagine creating a huge software program that can only be tested in little pieces on a computer that is slightly different from what it is supposed to run on. However, when you do run it as a whole on the actual computer for the first time, it must run almost flawlessly without a single significant bug. When is the last time you saw a software program do that?”
Conversation: Elon Musk on Wired Science (2007)
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Elon Musk 91
South African-born American entrepreneur 1971Related quotes
“DNA is like a computer program but far, far more advanced than any software ever created.”
Source: The Road Ahead
As quoted in Grace Hopper : Navy Admiral and Computer Pioneer (1989) by Charlene W. Billings, p. 74 ISBN 089490194X
"Is the Brain’s Mind a Computer Program?", Scientific American (January 1990).
Source: Nemesis Games (2015), Chapter 7 (p. 76)
The Art of Doing Science and Engineering: Learning to Learn (1991)
                                        
                                        Dijkstra (1986)  Visuals for BP's Venture Research Conference http://www.cs.utexas.edu/users/EWD/transcriptions/EWD09xx/EWD963.html (EWD 963). 
1980s
                                    
                                        
                                        1978 Turing Award  Citation https://web.archive.org/web/20070708004814/http://awards.acm.org/citation.cfm?id=4173633&srt=all&aw=140&ao=AMTURING. 
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