One big roadblock for environments hoping to improve on the book with fancy interactive elements: they all require reading on a screen! And reading on a screen is almost universally terrible!
I've been getting increasingly worried about this—seems like a serious threat! (con't)
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For instance, expert readers generally read non-linearly, but object permanence issues really inhibit that on screens. (notes.andymatuschak.org/Maintaining_mu, notes.andymatuschak.org/Continuous-scr)
In many cases (eg. on e-readers) *performance* issues inhibit expert reading! Wild! (notes.andymatuschak.org/Poor_performan)
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Of course there are on-screen features which enhance expert reading… but on balance, I'm pretty reliably a worse reader when reading on screens.
Not thrilled about needing to solve those problems in addition to all the tools-for-thought ones! What do you find promising here?
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Much worse, I think, because of the performance issues; see

