If you like cars, and have some free time to browse around, The Old Car Manual Project has a lot of interesting - manuals, pictures, ads, and brochures for cars from the 20th century.
It's pretty amazing to look at the dramatic changes in styling of cars in the 40's, 50's and 60's.
A couple of misc. items -
I learned that there was an add-on feature 50 years ago that held a car on a hill automatically for the driver. This device was for a manual transmission (it disengaged the brake as you let out the clutch) - and would seem to be useful for people who drive in hilly cities and may have a tendency to ride the clutch, which can lead to premature replacements which aren't cheap. It would be handy for a car with an automatic transmission, to have the car not start to roll backwards when you stop (unless you tap the brake twice - or some other way disengage the auto-brake). It's weird that I ran across that, because I was thinking some sort of auto-brake would be a good idea earlier this week, while stopped in traffic going up a hill...I'm only 50 years or so late on that idea.
I also saw a brochure for a new "autopilot", also described as an "electronic robot" that would maintain the speed of the car automatically. It was what we know today as cruise-control but back in the 50's it was pretty cool stuff.
