Inventors of Writing Instruments
Inventors of a fountain pen and ballpoint pen saw the same fountain pen and found it flawed. First, one didn’t like that it leaked while the second didn’t like that it needed too much time to dry when it’s on the paper. And they made it better for all of us.
If you want to thank someone because you don’t have messy fingers and paper when you write with your fountain pen - thank Lewis Edson Waterman who improved a fountain pen and made it a useful tool.
If you are reading this, there is a high probability that you have at least one ballpoint pen in radius of 2 meters form yourself. And who deserves credit for that? László Bíró! (and his brother... and probably some more people...)