By Gregory L. Baker (Academy of the New Church College), Jerry P. Gollub (Haverford College, Pennsylvania)
By Sheine Peart
By Jan Brinkhuis, Vladimir Tikhomirov
By G. Lewis
By Matt Parker
By M. Foote
By Fauvel, John, Gray, Jeremy, John Fauvel, Jeremy Gray
By Karl Soreskos
By Brian S. Everitt, Professor Til Wykes
By Marion Cranmer, Catherine Musto, Catherine Mutso
By Wenham, Martin W
By School Mathematics Project
By Unknown
By D.C. Perkins, E.J. Perkins
By David Alan Herzog
By J.L. Smyrl
By Beare
By Patricia C. Kenschaft
By June Lowenstein
By Mary Jane Sterling
By Learning by Questions Team
By Mary Jane Sterling (Bradley University, Peoria, IL)
By Wendy Arnone
By Joseph Schmuller
By Peter H. Selby, Steve Slavin
By L. B. Resnick, W. W. Ford
By R. Davison, L. Cochrane