Name only one thing that has improved in my lifetime - there have been many changes - but for me -

- I think it is my breathing - my asthma symptoms are minimal now with medication and change of venue.

Being able to carry hundreds of books in one hand! My first Kindle was in 2009 and has made a huge difference for me.

Since age 10 in 1947, I grew up with kerosene lamps for lighting, wood burning fireplaces for heat and sometimes for cooking after age 10, windows for air conditioning, a pickup truck for transportation, and until age 10, a wood cookstove. When I was 10 we got electricity (REA= Rural Electric Administration (at that time). In a year or two we got butane delivery (now propane), we had no paved roads within 15 miles until 1950 when pavement which ended at the edge of our property, by the mid 50's the pavement was extended another 15 miles to the town south of us. Two neighbors to our north had telephones in the 50's, but in 1968, we paid to have about 3 miles of poles and wire to have a telephone and we paid to have all 8 party lines. None of us knew when that ended as the telephone didn't have or couldn't fine the paperwork. So you can see, what all improvements have happened since then that I have experienced. ( I grew up in Zavala County, Texas and population so sparse that my high school had a total number of about 200 kids the year I graduated. The county had one large town of about 8,000 inhabitants and two smaller towns of approximately 1,000 each. The closest one to my Dad's ranch was one of those 1,000 people towns. I rode a bus to school 21 miles away, but the bus route had to a mile off the pavement to pick up some students, then backtrack and another 4 or 5 miles away from that detour, we took another side trip another mile in the opposite direction to pick up others kids who had to come at least 4 or 5 miles just to catch the bus.

self threading sewing machines... always the hardest for me to do with my vision issues

Oooooooo yesssss how could I have missed this one!! And the fact that I can check out books from my local library or purchase them from Amazon at 3 am in my jammies!

Oh my, forgot my kindle too. How could I???? My first one back in 2009 too and paid about 300.00 for it, absolutely loved it, and have never been without a kindle since. No more mountains of books taking up valuable real estate in my home, no more purchasing the same book because the cover changed and my memory couldn't recall that I had read it, and being able to carry my whole library in a small thin device wherever I go.
Thank you Peckish and Cindyw for the reminder......

Amazon has been a lifesaver during this pandemic. Also Alexa!

indoor plumbing

The comfort of socks.

Cooking spray! I made a bundt cake using my old bundt pan. Before the spray, I would grease the pan and flour it, and there still was the possibility of it sticking. My bundt cake just popped right out with the spray! Of course there are so many other great things that others mentioned.