New paper-thin batteries which can be printed on like paper has the ad industry salivating. The battery paper can be used to make novel product packages, such as boxes that light up or play music when they’re touched. “The number one reason would be the marketing advantage that would allow you to reach consumers one more time with an advertising or marketing or promotional message,” says a spokeswoman for New York’s International Paper. Baruch Levanon, co-founder of Paper Ltd. in Tel Aviv, Israel, says the technology “opens a whole range of microelectronics uses.” (AP) ...Right, like a whole new generation of letter bombs.