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johngordon
    Knots 3D [itunes.apple.com] “Utterly brilliant, this is the best example of a 21st century reference or tutorial text I have yet seen. Seriously. We need hundreds like this.” ★★★★★ [appiast.net] #tutorial #reference
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      johngordon
        ... Realizing when I last saw an app like Knots 3D. Twenty-five years ago, when HyperCard was hot. Tech progress is damned non-linear.
          joanna
            @johngordon That looks very nice.
              davmendels
                @johngordon of course you’re in topology as well ;-)
                  clarkgoble
                    @johngordon Used this in my cub scout den meeting a few months ago to teach the kids how to tie knots.