Equations
Exponential Equations in Science II: The Constant e and Limits to Growth
Further Exploration
An Intuitive Guide to Exponential Functions and e
Biography

Research
Google - Research database allows searching of the scholarly literature.
Experiment!
The Compound Interest Calculator visually shows the dramatic effect that compounding can have on investments.
Next Generation Science Standards (NGSS)
Next Generation Science Standards: For States, By States
National Academies Press: A Framework for K-12 Science Education