Ever wonder how those scratch and sniff stickers manage to pack a punch of aroma into what looks like ordinary paper? The technology behind it is deceptively clever, and has been used everywhere from ...

Ever wonder how those scratch and sniff stickers manage to pack a punch of aroma into what looks like ordinary paper? The technology behind it is deceptively clever, and has been used everywhere from ...

Remember “scratch and sniff,” the bygone technology behind fragrant children’s stickers and magazine inserts? It has lingered in the nation’s memory for a half-century. Like an insistent odor, some ...