Searching the Boolean way

One of the challenges we face is how to teach students to search well.
Jane Knight posted this interesting new tool, Boolify, which seems ideal for children--and, well, some of us adults, too!
By moving icons, such as "and" "but" and "or" onto the screen, one is able to use search terms to limit those ever-expanding internet searches.
I am definitely going to explore this one.