You’re making my point for me here. You say that both cultures share the certainty that they have hands, that objects don’t vanish, that parents exist. Those are hinges, and they have nothing to do with science. The fact that what differentiates the two cultures in this particular example is scientific knowledge doesn’t show your point that hinges are scientific. It shows the opposite. The shared hinges are the non-scientific ones. The scientific content is what varies. The hinges both cultures share, hands, objects, parents, have nothing to do with science. What differs between the cultures is the scientific content, not the bedrock
“Replication does not add another layer, it tests to see whether the testimony can be verified and accepted.”
Think about what replication actually involves. The replicating scientist reads a paper, trusts that the methodology was accurately reported, trusts that the data wasn’t fabricated, trusts that the instruments described were the ones used, and attempts to reproduce the result using equipment built and calibrated by other people whose work they also take on trust. Every step of that process is saturated with testimony. Replication doesn’t stand outside testimony as an independent check. It operates within a web of testimony at every level.
“I can understand your thinking this given your claims about NDE and such.”
This is irrelevant to the argument.
“What would our world-picture look like without science? How different is our world-picture from what it was a hundred or a thousand years ago? Do you think science has played only a minor part in those changes?”
I’ve never said science plays only a minor part. But reshaping the riverbed isn’t the same as being the riverbed. A thousand years ago our world-picture was different, but it was still a world-picture with hinges. People acted with the certainty that the ground would hold, that other people existed, that their children were their children, that the past was real. Those certainties aren’t scientific and they haven’t changed with science.
“Descartes’ provisional morality… It is provisional because the project of modern science, the conquest of nature, will change the order of the world.”
This is revealing because it exposes the assumption driving your reading. You’re treating moral certainties as placeholders waiting to be replaced by scientific progress. But that’s Descartes’s view, not Witt’s. Witt would say moral certainties function as hinges within our form of life the same way any other certainties do. They stand fast not because science hasn’t gotten around to replacing them, but because they’re part of the inherited background within which we live and act.
“To the contrary, your view of science is far too narrow.”
I have said that science is a composite practice built on more fundamental routes of justification like testimony, sensory experience, and logic. That’s not a narrow view of science. It’s a view of science that sits within our practices of justification. But the main point isn’t about science at all. It’s about the scope of hinges. And OC 342 is instructive here. It says it belongs to the logic of “our scientific investigations” that certain things are not doubted. That’s Witt saying science presupposes hinges, not that hinges are science. You have the dependency backwards. OC 94 says, “the inherited background against which I distinguish between true and false.” That’s our form of life, not our science. OC 204 is saying giving grounds comes to an end, and what lies at the bottom is “our acting.” Our acting, not our science. OC 253 also says, “At the foundation of well-founded belief lies belief that is not founded.” Not scientifically founded. Not founded at all. The text points consistently to something deeper and wider than science.