Computer Science Unplugged is a series of learning activities that reveals a little-known secret: computer science isn’t really about computers at all!
Unplugged teaches principles of computer science such as binary numbers, algorithms and data compression through games and puzzles that use cards, string, crayons and lots of running around.
Unplugged is suitable for people of all ages, from elementary school to university, and from many countries and backgrounds. Unplugged has been used around the world for over fifteen years, in classrooms, science centers, homes, and even for holiday events in a park!
The activities are primarily aimed at the five to twelve year-old age group, but they are by no means restricted to this age range: we’ve used them to teach older children and adults too, with little modification.
You can download “Teachers’ Edition” book for free from here and each activity is available to download in PDF format (see “Activities” section from the web site).
Please check out Computer Science Unplugged Site for details. 
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Good ideas. Computer how-tos are the most popular subject in the internet. A dummy and simplest tip might be very useful for considering the wide variety of internet users are.