by Louis L'Amour
by Michio Kaku
by Nick Cook
by Alan E. Rubin
by Sholom Glouberman
by David M. Wittman
by James Juniper
by Matilde Marcolli
by Laurie Halse Anderson
by Charles W. Misner, Kip S. Thorne, John Archibald Wheeler, David I. Kaiser
by Sean Carroll
by Gregory L. Baker, Jerry P. Gollub
by C. L�mmerzahl, C. W. F. Everitt, F. W. Hehl