A young English professor opened his first lecture for freshmen with a question, "Could anyone give an example of a sentence using the word learn, please?"
A student raised his hand and said, "I learn physics".
"Good", continued the professor, "but since you are now not in high school anymore, could you rather give a more interesting example? A more scientific one perhaps?"
The student thought for a few seconds. Then he came up with another example, "Albert Einstein learned physics".