The 7 Greatest Ideas in History

Image: Wikipedia

We all have ideas all the time. Some are good, but rather ordinary, (like spontaneously buying flowers for your wife on the way home), some are bad (like buying her a knife set for her birthday) and others, like Google’s PageRank are unquestionably great.

Just a few stand out above all the rest. They change the course of history and affect the lives of millions who aren’t even aware of them. Amazingly, some…