While getting together a list of YouTube videos to help with my teaching I came across a gem called "What the heck is Boolean searching?" from Hunter Library, West Carolina University. Fancy seeing Boolean explained using peanut butter, strawberry or fig jelly sandwiches, delivered with a superb Southern drawl? And when she comes to searches using brackets (or parentheses) bananas come into the "equation" too... It's quite a cute idea (messy too). However, it IS memorable and Tony Buzan ("Use your head") in his memory techniques always recommended use of very strong images, tastes, or associations. This is particuarly strong for me as peanut butter and strawberry jam sandwiches are one of the most awful tastes I have ever had!