We were just talking the other day about TV coming out (first ones for sale) in 1939. Of course what was there to watch?
Penicillin was in full production at the end of WW 2, so that is off by a few years.
"you could spend your nickel on enough stamps to mail 1 letter and 2 postcards. " - in 1952 (59 years ago) that would have cost 7 cents.
credit cards - from Wikipedia -- "The modern credit card was the successor of a variety of merchant credit schemes. It was first used in the 1920s, in the United States, specifically to sell fuel to a growing number of automobile owners. In 1938 several companies started to accept each other's cards. Western Union had begun issuing charge cards to its frequent customers in 1921. Some charge cards were printed on paper card stock, but were easily counterfeited.
The Charga-Plate, developed in 1928, was an early predecessor to the credit card and used in the U.S. from the 1930s to the late 1950s"
And I don't even have to check Wikipedia on the frozen foods, pretty sure they came out in the 1920's or so.
Can't help it, it is the librarian in me.... ;)