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Calculus Models
1. Aligator Egg   (Jan 7 2008)   An extension of one of the MHF rate of change units  
2. The changing length of the day   (Jan 7 2008)   Using the derivative of the sin to see the change in the length of the day.  
3. Two tanks   (Jan 7 2008)   A lovely extension of the water tank unit from MHF  
4. Alphabeta   (Jan 7 2008)   An extension of one of the MHF rate of change units  
5. Envelopes   (Jan 7 2008)   An elegant exploration using the ideas of calculus.