Here are three web pages with discussions of the Catalan numbers.
<li>
<a href="http://mathforum.org/advanced/robertd/catalan.html">Catalan numbers</a>
</li>

<li>
<a href="http://www.geometer.org/mathcircles/catalan.pdf">Catalan numbers</a></li>

<li>
<a href="http://mathworld.wolfram.com/CatalanNumber.html">Catalan numbers</a></li>

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This is reference to an article by Vaughan Jones on the Jones polynomial.
<li>
<a href="http://math.berkeley.edu/~vfr/jones.pdf">The Jones polynomial</a></li>

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Here are two links to web sites on knots.
<li>
<a href="http://www.earlham.edu/~peters/knotlink.htm">Knots</a> 
</li>

<li>
<a href="http://www.cs.ubc.ca/nest/imager/contributions/scharein/KnotPlot.html">
KnotPlot</a> 
</li>

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This is a link to Dror Bar Natan's web site on knots and their invariants.
<li>
<a href="http://www.math.toronto.edu/~drorbn/KAtlas/">Knot Atlas</a> 

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This is an article celebrating the 50th anniversary of Onsanger's solution of the Ising model and explaining the significance of this achievement.<br>
<a href="9511003.pdf">Onsanger's solution</a>

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Here is a collection of links to pages with a Java Applet which
simulates the Ising model.
<li>
<a href="http://www.phy.syr.edu/courses/ijmp_c/Ising.html">Ising model</a></li>

<li>
<a href="http://www.physics.buffalo.edu/gonsalves/ComPhys_1998/Java/Ising.html">Ising model</a></li>

<li>
<a href="http://www2.truman.edu/~velasco/ising.html">Ising model</a></li>

<li>
<a href="http://threeplusone.com/code/ising.html">Ising model</a></li>

<li>
<a href="http://pauli.uni-muenster.de/java/ising.html">Ising model</a></li>

<li>
<a href="http://www.particle.kth.se/~fmi/kurs/PhysicsSimulation/Lectures/09B/">Ising model</a></li>

<li>
<a href="http://www.pha.jhu.edu/~javalab/ising/ising.html">Ising model</a></li>

Here are three links to simulations of the Potts models.

<li>
<a href="http://www-reynal.ensea.fr/applets/spin-models/en/potts.html">Potts model</a></li>

<li>
<a href="http://www.pha.jhu.edu/~javalab/potts/potts.html">Potts model</a></li>

<li>
<a href="http://www-reynal.ensea.fr/applets/spin-models/en/pottswl.html">Potts model</a></li>


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This is a prototype for a program to draw knots.
This prototype was writen by my brother Nigel Westbury.
<a href="http://www.miegel.org/knot">Knot Editor</a></li>
<br>

<H3><HR WIDTH="100%">Nigel's link drawing program<HR WIDTH="100%"></H3>

<center>
<APPLET code="KnotEditor.class" width=450 height=300></APPLET>
</center>

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This is a program for drawing a knot and calculating the Jones
polynomial. First draw the knot by clicking on a sequence of
points on the grid. This will give the unknot. However if you click
on a crossing it will change the type. When you have done this at
a number of crossings you may get a non-trivial knot. You can test
this by calculating the Jones polynomial.

<center>
<APPLET code="Draw" height="400" width="800"> </APPLET>
</center>


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