Among other things, the band can record how much distance the wearer has covered in a day and how many calories he has burned, and can even monitor his sleep patterns.

ECONOMIST: Technology will become even more personal

Young travelers do the four-day hike, which covers a distance of about 27 miles, camping in tents along the way.

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That, apparently, is the distance that a medieval horse could lug a cartload of produce to market and return home in a day.

ECONOMIST: Food fresh from the farmer is profitable and popular