Almost everything you know, a stranger told you

You weren't there for almost anything you take to be true. The shape of atoms, the fall of an empire, what lies at the bottom of the sea, how your own heart works: none of it did you check yourself. It all arrived second-, third-, tenth-hand.

We live held up by an immense, invisible web of trust in strangers: those who measured, those who wrote it down, those who corrected the ones before. That isn't weakness; it's what let us get from the cave to the Moon without each of us repeating every experiment.

But if your knowledge of the world is borrowed — and it is — then the key question isn't “what do I know?”, but “whom do I lend my trust to, and why?”. Choosing your sources well isn't a detail: it is, literally, choosing which world you live in.