P. 48 The Magic School Bus Inside the Human Body (3S05) is a 5-day only title. The catalog description should have the same notation as the book above (Listening to Crickets):
"(Optional for 4-day Science Program)"
There is also an error in the 4-day Science IG that schedules this book as a regular part of the program. It should be listed as optional in the IG also.