Sonic devices chase kids away

Tired of teens loitering around your store? Just buy the "mosquito" -- a gadget that emits a noise at the upper edge of human hearing, in a range audible (and annoying) to those under 20 but generally harmless to old fogeys. Then watch your next generation of customers leave the premises, never to return with their money! Unsurprisingly, the gadget has caused a bit of controversy. ...read more