Just because something doesn't do what you planned it to do doesn't mean it's useless.

I didn't fail 1000 times. The light bulb was an invention with 1000 steps.

His genius he was quite content in one brief sentence to define; Of inspiration one percent, of perspiration, ninety nine.

Most of the exercise I get is from standing and walking around laboratory tables all day. I derive more benefit and entertainment from this than some of my friends and competitors get from playing games like golf.

Great ideas originate in the muscles.

When we learn how to store electricity, we will cease being apes ourselves; until then we are tailless orangutans. You see, we should utilize natural forces and thus get all of our power. Sunshine is a form of energy, and the winds and the tides are manifestations of energy. Do we use them? Oh, no! We burn up wood and coal, as renters burn up the front fence for fuel. We live like squatters, not as if we owned the property.

I can never pick up a thing without wishing to improve it.