The cars used were made with the K'Nex building set. K'Nex are
really cool, not terribly expensive and very flexible in their use.
They are also readily available at your local toy store. However,
the activities do not require that you use K'Nex, you can use any
car-like object, as Pat DeCoster mentioned.
Colleen Keirn, Ed.M.
The Annenberg Channel
c/o Harvard-Smithsonian Center for Astrophysics
60 Garden Street - MS 82
Cambridge, MA 02138 USA
Phone: 617-496-7686 / 800-228-8030 x3
Email: firstname.lastname@example.org / email@example.com
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