While we haven't had a chance to go hands-on in a car with Turn-By-Turn, in our walking tests, it worked as you would expect.

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And we're going to reform and strengthen Medicare for the long haul, but we do it by reducing the cost of health care, by making the health care system smarter so that instead of five tests you get one test, and then it's emailed everywhere.

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But you get what you pay for: tests suggest it can cut road noise in half.

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"Instead of having five different tests that each of you is charging for, do one test and email it to everybody, " he said to applause.

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But experts say there are land mines out there, and tests you don't want to have, because the results could make it tough for you to get insurance later.

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This will be a really big deal if it works, and small-scale field tests seem promising. (The quality of the video below is lousy, but it gives you the idea.) The most intriguing thing about Square, though, at least so far, is the conceptual leap that Dorsey may have been uniquely qualified to make: Payment transactions are a kind of social interchange.

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How big a setback do you think it was for relations in this part of the world that he carried out those missile tests in July?

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