Isolated facts and experiments have in themselves no value, however great their number may be. They only become valuable in a theoretical or practical point of view when they make us acquainted with the law of a series of uniformly recurring phenomena, or, it may be, only give a negative result showing an incompleteness in our knowledge of such a law, till then held to be perfect.
Interpretation
Facts and experiments gain value only when they reveal consistent patterns or highlight gaps in our understanding.
This quote by Hermann Von Helmholtz emphasizes the importance of synthesizing individual facts and experiments into a broader understanding of the underlying laws of nature. Merely accumulating data without context does not advance knowledge; rather, it is the connection of these facts into a coherent theory that gives them significance, whether by demonstrating consistent phenomena or revealing our ignorance of existing laws.
In practice
In a science class discussing the importance of applying theory to experiments.
The total quantity of all the forces capable of work in the whole universe remains eternal and unchanged throughout all their changes. All change in nature amounts to this, that force can change its form and locality, without its quantity being changed. The universe possesses, once for all, a store of force which is not altered by any change of phenomena, can neither be increased nor diminished, and which maintains any change which takes place on it.
Black is real sensation, even if it is produced by entire absence of light. The sensation of black is distinctly different from the lack of all sensations.
Whoever, in the pursuit of science, seeks after immediate practical utility, may generally rest assured that he will seek in vain.
The word 'universe' is obviously not intended to have a plural, but science has evolved in such a way that we need a plural noun for something similar to what we ordinarily call our universe.
Development of Western science is based on two great achievements: the invention of the formal logical system (in Euclidean geometry) by the Greek philosophers, and the discovery of the possibility to find out causal relationships by systematic experiment (during the Renaissance). In my opinion, one has not to be astonished that the Chinese sages have not made these steps. The astonishing thing is that these discoveries were made at all.
Half of what we know is wrong, the purpose of science is to determine which half.
If your payloads cost hundreds of millions of dollars, they actually cost more than the launch. It puts a lot of pressure on the launch vehicle not to change, to be very stable. Reliability becomes much more important than the cost. It's hard to get off of that equilibrium.
Everything was so new - the whole idea of going into space was new and daring. There were no textbooks, so we had to write them.
Science reserves the highest reward for those of you who disprove our most cherished beliefs. At any moment someone from any walk of life could come forward and be responsible for a complete revision of our view of everything.
Subscribe for the occasional hand-picked quote. No noise.