what is the most noteworthy invention prior to 1950?and why?

Question

telephone? 1876


or something else?

Answer 1

The automobile-it has changed the economy,society,caused global crisis ( pollution, wars) and even changed the way we eat.

Answer 2

I would say the ability to harness power (electricity, steam engine, etc).

That is really what began the industrial revolution. Without that, no railroads, lights, large cities (as we know them), cars, factories, etc.