Did you get it? There’s more math humor on Eric Postpischil’s Math page. I had to dredge up ancient studies in differential equations to get some of them.
This is a sample from one of my all time favorite humor sites, Indexed.com, where Jessica Hagy puts the fun into Venn diagrams.
On a more serious and scholarly note here are some potentially, very useful math resources I’ve come across:
For younger kids, A Maths Dictionary for Kids is “an animated, interactive dictionary for students which explains over 500 common mathematical terms in simple language.” It’s produced by Aussie teacher Jenny Eather who also developed Rainforest Maths, a collection of math games for grades k-6. Both of these sites are vividly colored with a nature theme, easy to understand and fun to use.
I’ve just installed this free Algebra 1 course from the folks at Kinetic Books. It’s a comprehensive digital course that adheres to standards. If anyone has used their products please leave a comment; I’ve clicked through a couple lessons and they are very good. A visual student would probably like the layout. Physics courses are also available at a very reasonable cost and with optional labs. (HT: homeschoolmath)
GeoGebra is a visual tool to plot algebraic functions and create geometric objects. It is a free download installation.
On the one hand, GeoGebra is a dynamic geometry system. You can do constructions with points, vectors, segments, lines, conic sections as well as functions and change them dynamically afterwards.
On the other hand, equations and coordinates can be entered directly. Thus, GeoGebra has the ability to deal with variables for numbers, vectors and points, finds derivatives and integrals of functions and offers commands like Root or Extremum.
GeoGebra can be used at both the high school and college level. GeoGebrawiki has extensive resources and lessons on how to use this tool in teaching.
Swivel is an interesting Web 2.0 social app that plots data. A user inputs data and swivel 
produces a plot that is public and commentable and shareable. Folks have uploaded all kinds of data, ordinary and bizarre. How about a coolness rating for sharks? The price of pigs in Europe? Price comparison of brand name and generic drugs? There are over four million plots. Feel free to add your own.
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