[pkorzeniewski]

In my opinion nothing can beat the beginning of 20th century. Cars, airplanes, phones, television, radio - all that originated (or have been widely adapted) one hundred years ago. Internet and smartphones are inventions from the last 20 years, before that I can't think about any inventions that drastically changed our every day life.

[JonnieCache]

Don't forget quantum mechanics, relativity and the discovery of the expanding universe, also all around that time. The last one wasn't really an innovation to be fair.