David A Adler

On Green Day at her school, Cam and her classmates discuss ways to protect the environment, but when money collected for the the school's new skylights disappears, Cam uses her photographic memory to solve the mystery.

When a cat appears in their classroom one rainy day, Cam and her friend Eric figure out where it came from.

When a baseball game is stopped because of a lost ball, Cam uses her photographic memory to find the ball.

Follows the life of the popular president, from his childhood on the frontier to his assassination after the end of the Civil War.

Using her photographic memory Cam Jansen joins Eric in solving the mystery of how some of the school computers were stolen.

Fifth-grade sleuth Cam Jansen uses her photographic memory to solve a monkey smuggling mystery at the city zoo.

On a field trip to the zoo, Cam Jansen uses her photographic memory to help solve what happened to Danny's lunch.

Presents the life of the nineteenth-century Frenchman, accidentally blinded as a child, who originated the raised dot system of reading and writing used throughout the world by the blind.

In his latest case, young Jeffrey Bones tries to discover the whereabouts of his grandfather's missing birthday present.

Introduces the seven symbols and their values, shows how to add and subtract to make numbers. Teaches how the symbols interact and about the bar across the top and the open box that are used for larger numbers. Shows Roman numerals in real life settings: on clocks, in books, and on buildings.