Her students agree.One young man with a patent for an unbreakable umbrella is walking proof of McLean's statement.“If I had not heard the story of the windshield wiper's invention，” said Tommy Lee, a senior physics major, “I never would have dreamed of turning my bad experience during a rainstorm into something so constructive.” Lee is currently negotiating to sell his patent to an umbrella producer.

　　So, just what is the story behind the windshield wiper? Well, Mary Anderson came up with the idea in 1902 after a visit to New York City.The day was cold and stormy, but Anderson still wanted to see the sights，so she jumped aboard a streetcar.Noticing that the driver was struggling to see through the snow covering the windshield, she found herself wondering why there couldn't be a built­in device for cleaning the window.Still wondering about this when she returned home to Birmingham, Alabama, Anderson started drafting out solutions.One of her ideas, a lever (操作杆) on the inside of a vehicle that would control an arm on the outside，became the first windshield wiper.

　　Today we benefit from countless inventions and innovations.It's hard to imagine driving without Garrett A．Morgan's traffic light.It's equally impossible to picture a world without Katherine J．Blodgett's innovation that makes glass invisible.Can you picture life without clear windows and eyeglasses?

　　51．By mentioning “traffic light” and “windshield wiper”， the author indicates that countless inventions are ________.

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