Lots of the newer cars have a Back-Up Sensor that warns the driver before the rear bumper actually comes in contact with something.
Who invented the backup sensor?
I bet you think it was Ford, maybe GM, how about Chrysler, no, then how about Mercedes Benz? Or possibly the French or Italians.
No! It was a Chinese farmer!
Surprisingly it was not developed by modern automotive engineers using the latest technology. It was disclosed recently that the first to develop the Back-up-Sensor was a Chinese Farmer. His invention was simple and effective. It emits a high-pitch before the vehicle backs into something..
Here’s his first prototype…

(I got this in an email, so it must be true)