Last seen in:
- New York Times - Mar 30 2018
- Wall Street Journal - Jul 9 2016 - One-Upmanship
- The Chronicle of Higher Education - Feb 24 2012
- Wall Street Journal - Sep 23 2011 - September 23, 2011 - Puzzle 700
- Wall Street Journal - Mar 2 2007 - March 2, 2007 - iTunes
- L.A. Times Sunday - Jul 9 2006
- USA Today - Jun 15 2005
- Wall Street Journal - May 27 2005 - May 27, 2005 - Reliving the Past
- Wall Street Journal - Apr 1 2005 - April 01, 2005 - The Periodic Tabloid of the Elements
- New York Times - Oct 17 2004