For Us, The Living by Robert Heinlein

I have recently been reading a book called "For Us, The Living" by Robert Heinlein. It is about a man named Perry Nelson from the year 1939 who died from his car being driven off of a cliff, and wakes up in the year 2086. He nearly dies from frostbite until a woman named Diana finds him and brings him into her home. Her and her friends proceed to explain the ways of the world in 2086 and all history from 1939 to then of relevance to him. I think that this book is interesting because Robert Heinlein made a lot of assumptions which aren't true. It's cool to see what people thought the 21st century would be like in the early 1900's.