Dan Gutman 
My Weirder School #8: Dr. Nicholas Is Ridiculous! 

With more than 30 million books sold, the My Weird School series really gets kids reading!In this eighth book in the My Weirder School series, college professor Dr. Nicholas visits A.J.s class to help the students improve their standardized test scores in history. The weird thing is, Dr. Nicholas doesnt care about the date Christopher Columbus came to America, who wrote the Declaration of Independence, or other important historical facts. Shes more interested in weird information like the history of the toilet bowl! She even built a time machine to take the class on a field trip to the past and future. Who will get stuck in time? And how will they get out?Perfect for reluctant readers and word lovers alike, Dan Gutmans hugely popular My Weird School series has something for everyone. Dont miss the hilarious adventures of A.J. and the gang.