“Facts change all the time.”
How is this possible? A fact is a fact is a fact. What Samuel Arbesman means is not that fundamental laws of nature will suddenly reverse and good-bye gravity, but that our understanding of the universe is imperfect and that scientific “knowledge” is constantly being revised as we develop new techniques and discover new things.
For example he tells the astonishing story that in 1912 biologists found forty-eight chromosomes in the human cell, and it was accepted as established fact. After that, some other scientists found only forty-six chromosomes, but they assumed that they had made a mistake. Finally by 1956 the new lower number was recognized, and it is so universally accepted these days that I didn’t know there had ever been any doubt about it.
From my time as a Science Liaison Librarian in a university library, I know that science is iterative — one small discovery builds on another — and unpredictable as to which ones may be useful in another discovery. As I told students, chemical scientists write 30-page papers about one chemical (which are generally unintelligible, except to other chemists), and any paper may one day have an unexpected medical or industrial purpose.
Samuel Arbesman doesn’t claim to know which facts will become obsolete and change (obviously he’d be omniscient in that case). What he does argue is that the rate of change of facts is perfectly predictable by scientific models, like the radioactive decay of atoms. You cannot predict which atom will decay, just that in a set number of years that half of them will be decayed, thus a “half life” of either atoms or facts.
Samuel Arbesman uses dozens of examples, ancient and modern from child bed fever to computer speeds to make his arguments, and includes gentle humor: “Many of us only view ‘technology’ as anything invented after we were born.” I find his basic premise about the impermanence of facts very plausible although I don’t always agree with his details.
Try The Half-Life of Facts if you are a science fan, especially if you like books about the way genuine science can be twisted to promote unscientific ends, such as Proofiness, by Charles Seife.
Check the WRL catalog for The Half-Life of Facts.
Blogging for a Good Book 
does it not explain the one thing, they can’t explain, the constant God, who never changed, we just moved out of the orbit so to speak
bwcarey
You are definitely right that science cannot explain every observed phenomena. Personally, I doubt science ever will explain everything, but I may be wrong about that!
Jan
I will have to check this book out, I’m not sure I would agree with his conclusions, but the mutability of what we know is an important educational point. I often think students and society would be better served if our science education focused less on formulas and experiments and more on the scientific method and the history of knowledge. So much pseudo-science and superstition exploits fear, doubt and the poor understanding the system produces. For example confusing causation with correlation.
justjase79
Absolutely! The only two things I remember from my advanced statistics class from over twenty years ago are the definition of true randomness and that correlation does not mean causation. And the professor emphasized that one over and over – correlation does not mean causation, correlation does not mean causation, correlation does not mean causation….
It is very, very common to see in the news that variable A got larger and variable B got larger so we are absolutely sure that variable A caused variable B. And if it suits a politician or whoever wants it to look like causation, then they completely ignore that they may have it completely backwards and variable B may have caused variable A or that they might completely unrelated.
Jan