Time is really the only capital that any human being has and the thing that he can least afford to waste or lose.
Through all the years of experimenting and research, I never once made a discovery. I start where the last man left off. All my work was deductive, and the results I achieved were those of invention pure and simple.
The three great essentials to achieve anything worth while are: Hard work, Stick-to-itiveness, and Common sense.