In my forty years as an academic I found that many people preferred the precision of science and math to the "opinion" of discussions and teaching of religion, literature and the arts.

One can debate whether or not fire was a discovery or an invention.  What is less debatable is that the advent of cooking changed human history and even human physiology.

Liberal, conservative, progressive, mainstream:  these are words that we use in conversation all the time.

There are many other candidates for the list of the world's greatest inventions that one might consider besides the disposable diaper, the microwave oven and the thermos bottle.