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10-Second Microfilm Contest Page 

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Nautilus  Anatomy: The nautilus is a complex animal that moves into increasingly larger chambers while abandoning the old chambers for buoyancy. What does that mean? This interactivity allows students to adjust the transparency of the external shell, external body features, internal organs, and the internal shell chambers. (Note -- this one ended up on the Encarta box.)

Probability: Why don't casinos ever go broke? I used the game of craps to illustrate the predictability of random events. The student can set the computer to roll a pair dice 6 times and view the results. With a sample size of 6, the distribution is scattered without a visible pattern. When they choose 60, 600, or 6000 random rolls, the predictable ratios become more obvious.

DNA Structure: How does DNA copy itself? This interactivity allows students to split a strand of DNA and then plug in the appropriate nucleotides. Because of the shape of these nucleotides, the final result is always two exact copies of the original strand.