By N/A
By National Geographic, John Glenn
By Various Authors
By Fishbein, Seymour L.
By National Geographic Magazinbe
By Monica Halpern
By Crump, Donald J, Gray, William R
By Barbara Lalicki
By Geographic, National
By Daniels, Patricia S., Hyslop, Stephen G.
By Scott C. Anderson, John F. Cryan, Ph.D, Ted Dinan, M.D.
By Cline, Eric H.
By Cline, Diane Harris
By Tallack, Peter
By John Langone
By Miller, Belt & Brown
By Luc Jacquet
By Brandt, Anthony
By Kasser, Rodolphe
By Jones, Tom
By Belle Perez
By Harley Chan
By Trent Johnson
By White, Mel
By National Geographic: Our Mathematical World
By Buettner, Dan