Dear All
Maybe it's just me, but I don't see how you can use everyday concepts to explain Boolean operators. If you search for 'teenagers and obesity' you get fewer results than if you search for 'teenagers' or 'obesity' separately. However if you buy hats and shoes you get more in your shopping bag and if you mix gin and tonic you get more liquid in the glass.
I still can't see a better method than using the standard venn diagrams.
Jonathan Dews
