Through a mishap in Professor Bulfinch's laboratory, Danny accidentally creates an anti-gravity paint. The natural use, of course, is for a spaceship -- the pai

Danny uses a computer that Professor Bulfinch has created for NASA to prepare his homework, despite Professor Bullfinch's warning that Danny is to leave the mac

Danny and his friend Joe Pearson discover the entrance to a cave in the woods near their home. Professor Bulfinch has just invented a portable x-ray machine, an

A mistake by Danny leads to one of the Professor';s most startling inventions—ISIT, the Invisibility Simulator with Intromittent Transmission—a dragonfly-li

By accidentally short-circuiting Professor Bulfinch's new crystalline material, Danny Dunn enables the professor to create a new machine that makes Danny invisi