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"Its pretty much exactly what he wants, only just proprietary and not on the web."

Which is exactly what he doesn't want. The authoring tools should be accessible to everyone.

Secondly, after exploring his site I'm guessing Bret would reject Mathematica even if it were free & open source. Because even then it's not accessible to everyone - you still need to know how to program.

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One of his featured projects is 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.

Tangle is just a stepping stone as far as I can see: http://worrydream.com/KillMath/

Right now he's simply playing around with some basic ideas.

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