by Carl Sagan, Ann Druyan
by Tsugumi Ohba, Takeshi Obata
by Sylvia Day
by Leonard Susskind, Art Friedman
by Joshua Schimel
by Georg Simmel, Donald N. Levine
by Peter Atkins
by Steven Holzner
by Leonard Susskind, George Hrabovsky
by Paul E. Little, Lee Strobel
by Nancy Faber, Randall Faber
by Alan Alda
by Linda Null
by Dan Fullerton
by John T. Moore, Richard H. Langley