Absentminded when using credit cards? For one of those problems you may not have known you had, a Tokyo company has created an ingenious solution: a card- size device that plays Ave Maria, Yankee Doodle Dandy or one of 100 other tunes when exposed to light and won't shut up until returned to the darkness of a pocket or purse.
Company president Hiroshi Majima says he hatched the idea when a fellow traveler in China lost his passport, causing the tour group annoying delays. His invention, sold in four-packs for about $72, is meant to be attached to a wallet or...
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