Trivia: Which of the following is NOT an Einstein invention?
A type of refrigerator
A self-adjusting camera
A contact lens
A hearing aid
The correct answer is A contact lens
So why is this answer correct? : Einstein is best known for his scientific theories, but he loved to tinker with things, too. Among his inventions were a camera that adjusted to light on its own, a fridge with an electromagnetic pump, and an electro-acoustic hearing aid.