What is the most significant result based on the development of windmills and waterwheels?

The correct answer is "the tip-of-the-tongue phenomenon".

The Tip-of-the-tongue phenomenon refers to the event of neglecting to recover a word from memory, joined with incomplete review and the inclination that recovery is up and coming. The marvel's name originates from the platitude, "It's on the tip of my tongue." The tip of the tongue wonder uncovers that lexical access happens in stages.