Comment by mcontrac

I think the author is really just getting at the fact that humans are by nature intelligent and by nature tend to think of similar ideas. So you can either unknowingly complete a project which is inevitably in some sense a replication of another project, or you can do the research first and realize it's partially a replication which is a bit disheartening. I think the solution might lie in realizing that completing a project for the sake of your own learning might be the most important factor. (This is easier said than done is when you are trying to complete novel academic research or when you are trying to make a profit off of your unique project.) But those, too, are more than forgiving to research that seem only to slightly tweak something that already exists.