One of his featured projects is http://worrydream.com/#!/Tangle http://worrydream.com/#!/Tangle It requires knowing how to program. All I'm saying is that its

One of his featured projects is http://worrydream.com/#!/Tangle http://worrydream.com/#!/Tangle It requires knowing how to program. All I'm saying is that its a shame he doesn't seem to know about what Mathematica has done in version 6 and beyond, since its seems squarely up his alley... which is ironic because he specifically calls out Mathematica in the article for not being interactive enough.