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Many of the sites listed here were not available when we did our last list; although longevity is a mark of pride online, it is difficult for companies set up in the 1990s to reinvent themselves quickly enough to take advantage of new technologies. Although of course rapid change brings casualties too: it's possible that with all the economic turbulence going on that some of the sites here won't be around in a year from now, or that their now free services will have become paid-for. That doesn't diminish their usefulness, though; it just underlines their determination to survive.

"Project-based learning is not some new-fangled teaching method just coming into vogue. In fact, use of the PBL approach can be tracked back to the big thinkers, including Confucius, Aristotle and Socrates. Its longevity is due to one of the key outcomes it provides: keeping students happily engaged in rigorous learning. Of course, the ancient philosophers didn't foresee PBL's connection to ed tech, but they did seem to comprehend the benefits students derive from the approach, including a deep understanding of content, the ability to transfer knowledge to new contexts, improved ability to collaborate and better content retention, to name a few. "