Dava Sobel
Stephen Hawking
Rand McNally
Hal Lindsey
Sabine Hossenfelder
George B. Arfken
Thomson Gale
Robert A. Day
William M. Bass
Elizabeth Higginbotham
Arthur Koestler
Michael White
Firdos Alam Khan
Neil deGrasse Tyson
Adrianne E. Hardman
United States. General Accounting Office
David Turnbull
National Research Council
J. O'M Bockris
Brian Cathcart