Many anthropologists work with a concept called embodied knowledge - tacit, nonscientific knowledge - and look for ways to incorporate such information into product design.

Tim Berners-Lee, the 44-year-old English physicist who created the World Wide Web, is precisely the kind of hero that a relatively simple invention with profound social and economic consequences should lay claim to. He is not just creative but democratic, diplomatic, polite and generous with credit and praise.

Spurred by the unlimited texting plans offered by carriers like AT&T Mobility and Verizon Wireless, American teenagers sent and received an average of 2,272 text messages per month in the fourth quarter of 2008, according to the Nielsen Company - almost 80 messages a day, more than double the average of a year earlier.

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