"Math's Unsolved Mysteries," Website review in NetWatch column, edited by Jocelyn Kaiser. Science, 9 February 2001, page 951.
The editor calls this website compiled by Steven Finch of MathSoft, Inc., "an invaluable resource for those who wish to tilt at mathematical windmills." The site, which may be found at http://www.mathsoft.com/asolve, collects mathematical problems (and links to other problems) suitable for mathematicians and nonmathematicians.
--- Annette Emerson