It’s clear that things aren’t always what they seem. I’ve written on this subject before; see this link. But Particularly in scientific endeavors, all it takes is one experiment or reproducible observation to put things into the proverbial cocked hat.
Take this item, for example, in which is reported an experiment that seems to show that the speed of light in a vacuum is variable, as are the vacuum conditions under which such observations are made.
Complicated, I know, but who said the Universe was simple to understand?
Still, it did remind me that so much of what believe—know!—to be true may not be as fixed as we think it is, with concomitants that we probably had never thought about.
Questions: What do you “know” to be true? How do you know it? What consequences would there be if such a strongly held position (belief?) were shown to be variable, and not constant? Are you prepared to allow such “heretical” thoughts to enter your consciousness?