20 Questions
Here's a whole other thing: Have you seen this toy, sold at Walmart? http://www.walmart.com/catalog/product.do?product_id=4016333
It asks you to "think of something" and then proceeds to 'deduce' what it is you're thinking of through a series of questions to which the player can respond 'yes', 'no', 'sometimes' or 'rarely'.
Its a great demonstration of how 'concepts' are built. The designers have used a decision tree to allow the mechanism to arrive at a conclusion. What would the data bank, decision tree, or 'map' look like if kids drew it out?
In elementary school it could stimulate great '20 question' games in small or large groups. In secondary school, it fits right into Computer (data bases), Science & Math (algorithms) and English (literacy / concept attainment) curricula.

Community Involvement Projects

Here's a fun project to inspire teachers: "Kids with Cameras"'Kids with Cameras' is a non-profit organization that teaches the art of photography to marginalized children in communities around the world. They use photography to capture the imaginations of children, to empower them, building confidence, self-esteem and hope.http://www.kids-with-cameras.org/mission/ .But why not try your own? Or how about a community web site? 'Our' neighbourhood?Interesting Toronto 'take' / connection on this idea:http://www.cbc.ca/toronto/features/marywiens/and/or a web site like http://www.jane-finch.com/Another great idea that uses the community to teach. See also Wianassa Hills story.

Seniors Telling Youth Lefie Experiences http://abc.net.au/tv/btn/yournews/006_wanniassa.htm