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.
Q: Category: INVENTIONS 
Clue: Introduced at the 1900 World's Fair in Paris, its name comes from Latin for "one that takes you up the ladder"
A: 
escalator