Scratch-and-sniff cards prompt natural gas scareGREAT FALLS, Mont. (AP) â€" Those scratch-and-sniff cards the energy company sends to customers to teach them to recognize the artificial smell added to natural gas? Turns out they work pretty well.
Source: Scratch-and-sniff cards prompt natural gas scare (http://news.yahoo.com/scratch-sniff-cards-prompt-natural-gas-scare-191419550.html)