The laws of physics are in progress. We do not know all of the laws. Since we do not, each piece of the whole of nature is always merely an approximation of the complete truth, or the complete truth so far as we know it.
Some of the basic ideas of physics such as mass being constant, which is false at high speeds, or approximate, while some of the more complicated ideas, such as four dimensional space time or the theory of relativity, are less approximate. It speaks to the paradox of what to teach first, the basic yet more approximate or the advanced and less approximate.
Science is beautiful. It is egoless or at least idealistically comes across that way. We imagine, experiment, deduce, and guess. A new piece of information may completely overhaul our way of thinking, however small it may be. Things must be learned only to be unlearned again, or more likely, to be corrected.
The test of all knowledge is experiment.
In science you use a combination of imagination or conjecture, which is what the role of a theoretical scientist is, which then fuels experiments and testing, which is the role of an experimental scientist.
We are always vibrating. Even at absolute zero, our molecules will still move.