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Among other things he found a sharp hunting knife, on the keen blade of which he immediately proceeded to cut his finger. Undaunted he continued his experiments, finding that he could hack and hew splinters of wood from the table and chairs with this new toy.
--
Ch. 6 : Jungle Battles

 

Edgar Rice Burroughs

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The trenchant blade, Toledo trusty,
For want of fighting was grown rusty,
And ate into itself, for lack
Of somebody to hew and hack.

 

Samuel (poet Butler

 

Nimble finger and nimble wits will take you a good deal further than a sword and muscles. Sharp eyes help as well, but fortunately, I have these things.

 

Robert Jordan

 

A man has a right to use a saw, an axe, a plane, separately; may he not combine their uses on the same piece of wood? He has a right to use his knife to cut his meat, a fork to hold it; may a patentee take from him the right to combine their use on the same subject? Such a law, instead of enlarging our conveniences, as was intended, would most fearfully abridge them, and crowd us by monopolies out of the use of the things we have.

 

Thomas Jefferson

 

Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it. No matter how many times the results of experiments agree with some theory, you can never be sure that the next time the result will not contradict the theory. On the other hand, you can disprove a theory by finding even a single observation that disagrees with the predictions of the theory. As philosopher of science Karl Popper has emphasized, a good theory is characterized by the fact that it makes a number of predictions that could in principle be disproved or falsified by observation. Each time new experiments are observed to agree with the predictions the theory survives, and our confidence in it is increased; but if ever a new observation is found to disagree, we have to abandon or modify the theory.

 

Stephen Hawking

 

Let me explain a little: Certain things are bad so far as they go, such as pain, and no one, not even a lunatic, calls a tooth-ache good in itself; but a knife which cuts clumsily and with difficulty is called a bad knife, which it certainly is not. It is only not so good as other knives to which men have grown accustomed. A knife is never bad except on such rare occasions as that in which it is neatly and scientifically planted in the middle of one's back. The coarsest and bluntest knife which ever broke a pencil into pieces instead of sharpening it is a good thing in so far as it is a knife. It would have appeared a miracle in the Stone Age. What we call a bad knife is a good knife not good enough for us; what we call a bad hat is a good hat not good enough for us; what we call bad cookery is good cookery not good enough for us; what we call a bad civilization is a good civilization not good enough for us. We choose to call the great mass of the history of mankind bad, not because it is bad, but because we are better. This is palpably an unfair principle. Ivory may not be so white as snow, but the whole Arctic continent does not make ivory black.

 

Gilbert Keith Chesterton