List of sites with puzzles/problems

Site	Comments	Location	Rating
	Los Alamos Mega-Math project	Los Alamos	G
Naor's puzzler	Moni Naor's collection of Math puzzles	Weizmann Inst.	X
	The MathSoft Puzzle Page	Cambridge, MA, USA	R
	Physics Quiz	Germany	PG
Challenge	Physics Challenges	Duke University, USA	PG
	NRICH math online club	Cambridge University, England	G
	BrainTeasers by Quantum Journal	Nat.Sc. Teachers Assoc. (US)	G
	Physics Prob. Collection by A. Melikidze	Princeton University, NJ, USA	R
	"Ponder this" - math puzzles	IBM (T.J. Watson) Res.Labs, NY,USA	R
	"Physics of the outdoors" by S.M. van Roode	The Netherlands	R
Ortvay	Yearly Physics Competition	Hungary	R

The rating refers to the difficulty (prerequisite knowledge required) to solve a typical problem in that site. It is vaguely defined as follows: G=high-school; PG=high-school/undergraduate students; R=university students; X=graduate student/researcher.

If you know an address of an additional site with physics/math problems or puzzles, please mail the address to kantor@post.tau.ac.il

[Please, ask your webmaster or equivalent computer-wiz to include a reference (link) to our page (http://star.tau.ac.il/QUIZ/) in the appropriate web page of your organization.]