In this series of books by Bill Martin, Jr. and John Archambault, the lowercase letters climb a coconut tree in alphabetical order, until their weight causes the tree to bend so much that they all tumble out of the tree. Capital letters (the older relatives of the letters climbing the tree) come to help them. Again alphabetically, it describes each letter's injury.
At night, letter A comes back and climbs up the coconut tree, daring the other letters to catch him.
STEAM activities help promote essential 21st-century skills, which is important in preparing our children for an unknown future.