20 Most Important Inventions Of The Next 20 Years

Things are looking pretty bleak right now. But, the saying goes, necessity is the mother of invention. So BusinessWeek asked several futurists, including Futurist.com's Glen Hiemstra, consultant David Zach, and author Howard Rheingold, to describe what they'd like to see arise from the current downturn. Notably, our experts didn't think of innovation merely in terms of products or services. These ideas will change the way humans interact with the earth—and with each other.

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