Sliced bread? The bread slicing machine didn’t come into being officially until 1928 but the original prototype was in 1912 (alas a fire ate it).
How about instant iced tea? This is the hubbinator’s favorite saying even though neither of us drink it. It has been around since at least 1964.
But to me, the best invention was the washing machine. I’ve read enough history books to know all about how labor intensive washing clothes, etc were in the past and am very thankful to be able to load the clothes then do other tasks (like read) while my clothes are washed. I’m even more thankful when the hubbinator does the laundry:D
What about you? What do you think the best invention is?