So every time you let your spouse take your car you do a DNA test to make sure they haven't been switched with a look-alike? That's just a somewhat extreme ill

So every time you let your spouse take your car you do a DNA test to make sure they haven't been switched with a look-alike? That's just a somewhat extreme illustration of how you, and everybody else, has to rely on heuristics to evaluate statements. It's impossible to even prove a tenth of percentage points of the facts you rely on daily from first principle.