Question

Which inventions from the turn of the century directly changed life the most

Answer 1

The internal combustion engine.
There would be a lot less pollution, so less global warming.

Answer 2

I believe the answer is: The internet

The internet transform the average activities that people have compared to the pre-internet era. For example, in the past, people need to be physically present in a bank in order to conduct a transaction, with the internet the transaction could be done from the comfort of your own home using internet banking.