Nothing is more memorable than a smell. A scent can be unexpected, momentary, and fleeting, yet conjure up a childhood summer beside a lake, when wild blueberry bushes teemed with succulent fruit or another memory of baked cookies in the oven at grandma’s house in a countryside village or even a family barbecue in the late summer sunburnt grass yard … Hit a “tripwire” of smell, and memories explode all at once. A complex vision leaps out of the undergrowth.