Dan Gutman

When Ella Mentry School holds a science fair, Dr. Snow arrives to help A.J. and his friends conduct their experiments.

"Story time goes to the dogs when Ella Mentry School gets a therapy dog to help kids with their reading skills"-- Provided by publisher.

Ryan wants to form a curling team at school with A.J. and Andrea, but soon trouble amongst his teammates threatens to end their season early.

When he takes a ride in a U.F.O. to meet Janet, the head alien, Rappy must make a decision to live with her on Mars or return home.

Mrs. Meyer from the local fire department comes to Ella Mentry School to teach the kids about fire safety, but Mrs. Meyer likes fire just a little too much.

New lunch lady Ms. Hall is obsessed with healthy food and she makes it her mission to get A.J. and the gang to eat more vegetables, but they won't take this sitting down

Joey, who loves baseball but is not very good at it, finds a valuable 1909 Honus Wagner card and travels back in time to meet Honus.

When Mr. Will, the local ice cream man, brings treats to the students at Ella Mentry School, Dr. Carbies will stop at nothing to ensure no one breaks his latest rule banning desserts.

"Miss Z, a mysterious billionaire and a collector of rare photographs, is sending her four recruits back in time on a mission to capture, for the first time, one of the most important moments in American history--Abraham Lincoln giving his famous Gettysburg address"--

When the teachers of Ella Mentry School go on strike, A. J. and the gang meet a new principal who does not believe in rules and says that the students do not have to learn anything if they do not want to.