Thank You Notes: A Children's Story about Exponential Growth is an open-source children’s book in pdf form now available at
https://www.merlot.org/merlot/viewSite.htm?id=9162542 . It
begins with questions about ways people are helping one another in their families, neighborhoods, and communities. A child, Jasmine, decides to write a thank you note and the next day asks a friend to write one too. Each day, each note writer asks a sibling or a friend to write one. Exponential growth occurs beca