Ah, right, sorry. "At all" is equally fatuous, though. The philosophical problem of whether objective knowledge is attainable was settled centuries ago. "How d

Ah, right, sorry. "At all" is equally fatuous, though. The philosophical problem of whether objective knowledge is attainable was settled centuries ago. "How do you really know that Einstein's Relativity is valid?" is something that was settled when its predictions were borne out. If there are still questions about it, those will be settled by more science.