
Source: The Portable Dorothy Parker
Source: Superintelligence: Paths, Dangers, Strategies (2014), Ch. 6
Source: The Portable Dorothy Parker
Appearance in the National Geographic Channel program Naked Science: Alien Contact, as quoted in The New York Times (24 November 2004) http://query.nytimes.com/gst/fullpage.html?res=9C00E2D8173EF937A15752C1A9629C8B63&sec=&spon= and a CNN transcript of an interview with Seth Shostak from Anderson Cooper 360 (26 November 2004) http://transcripts.cnn.com/TRANSCRIPTS/0411/26/acd.01.html
How Many People Can Live on Planet Earth? (BBC Horizon, 2009)
“I could fill an entire second life with working on my prints.”
undated quotes, M.C. Escher Foundation
"Angelus", in Saint Peter's Square (14 December 2014) http://w2.vatican.va/content/francesco/en/angelus/2014/documents/papa-francesco_angelus_20141214.html
2010s, 2014