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Open source software was one of the earliest successful examples of a sharing economy that has had huge economic impact. But as alternative energy advocate Steve Baer once noted, ecosystem services are often ignored in economic analysis: when you put your clothes in the dryer, the energy you use is measured and counted, but when you hang them on the line, they disappear from the measured economy.

Salman Khan talks about how and why he created the remarkable Khan Academy, a carefully structured series of educational videos offering complete curricula in math and, now, other subjects. He shows the power of interactive exercises, and calls for teachers to consider flipping the traditional classroom script -- give students video lectures to watch at home, and do "homework" in the classroom with the teacher available to help.

The best way to do good in the world is not to be a philanthropist. It's to be a good capitalist. The need to 'give back' is generally chiefly a sign that people took too much to begin with.