In U.S., professors use a lot of technology equipment to show slides and movies.
Beside, he can show how the software work.
Students in the class can take their laptop to see read the material on web and use the laptop to do a lot of works.
Since Fast Food is one of distinct appearance of American culture, many people made fun with me before I came to U.S. about the banal food style.
This a stereotype of American and unfortunately this is the real America.
I don't know why there are SO many fast food on the street but no Chinese restaurant.