You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: INVENTORS 
Clue: Mainz, Germany celebrates the life of this inventor in an annual festival called Johannisnacht
johannes gutenberg

Category: MODERN MATERIALS 
Clue: Introduced in the '70s to replace steel belting on high-speed tires, it's called stronger than steel & lighter than nylon
kevlar

Category: COMPANY NAMES 
Clue: This company was named for the sound made by its top product -- a slingshot hitting its target

wham-o