Embedded in the heel of his shoe was an early example of the Internet of Things -- but Andrew Duncan didn't know it at the time.
"My girlfriend was able to watch me on the computer screen as I did a five-mile walk," recalls Duncan, a Los Angeles technology consultant, of his participation in an Alzheimer's fund-raising walk in November of 2010. "And the shoe will send you text message if the battery gets low, or if the wearer steps outside of set zones."
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