Provides information on some of the major inventions that have changed history, including what are some inventions that changed the course of history, who are some of the important inventors of the past century, what makes an invention a success, and more.

Frank and Joe Hardy receive an unusual assignment from their detective father. They are to "break into" the house of a Bayport neighbor, Malcolm Wright and retrieve a top-secret invention that the scientist had hidden in his study before leaving for California. The invention is in danger of being stolen and the boys race against time to beat the thieves at their own game. The young detectives soon discover that they are involved in a mystery far

...

When Flint returns to the island to help clean up after the disastrous food storm, he discover his machine now creates mutant food beasts, from which he and his friends must save the island from.

A young aspiring engineer must first conquer her fear of failure.

"No embarrassing secret is safe when Jimmy's latest invention takes invasion of privacy to new heights"--P. [4] of cover.

The inventive skills of Hooey Higgins and his friends are put to the test in an adventure that compels them to invent super-protective pants that they hope will safeguard them from crocodiles, flying toffee apples, and log-flume malfunctions.

Follows the adventures of a young boy and his neighbor friend as they travel through a computer portal into outer space, where they explore such mysteries as black holes and the origins of the universe, while trying to evade an evil scientist.

George and Harold and their doubles, Yesterday George and Yesterday Harold, have been taking turns going to school, but when the doubles fall prey to their gym teacher, Mr. Meaner, and his method of mind control that turns students into attentive, obedient, perfect children, it is up to original George and Harold to strike back.