[NittanyLion]

Even though I know it, upon reflection it's just incredible. One wonders what factors led to such rapid innovation. Education? Technology? Medicine?

[TomGuy]

I remember reading Alvin Toffler's Future Shock 30-some years ago. That book detailed how great the increase was (then) and how it impacted the 1970's generation. It was amazing how rapid "intelligence" increased--the last 100 years had human knowledge doubling every 20, then 10, then 5 years.

Consider how dependent much of the world is on the Internet. And it really wasn't "open" to the public until about 1994 or 1995.

And who can forget those great inventions---like hoola hoops.