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brain size against number of contacts and extrapolated to see how many friends a human ought to be able to handle. The number turned out to be about 150.

I like the Livescribe pens and find them useful. But as computers, they are a dead end. They're just not flexible enough to be general-purpose devices, like tablets. An iPad that worked well with pen input would make me drop the Echo. Apple's competitors already have rudimentary pen-based tablets out, and who knows, maybe the iPad 3 will have some surprises for us.

provides teachers access to lesson plans, worksheets and other teaching resources that integrate environmental, social and economic spheres through learning that is interdisciplinary and action oriented.