GeekDads might be interested in entering the new contest over at Discover Magazine, Evolution In Two Minutes Or Less. The contest rules say you can use any props, animations, geeklets, or other techniques to get your point across. The only unbreakable rule is the two-minute limit.
Why? As the site says:
Sounds like a good cause! Your prize is public appreciation from none other than PZ Myers, famous biologist at the University of Minnesota. Submissions are accepted until June 1, so get to work!