General Discussion

Of course we know things. Whether what we know will be accurate still in a day, or a year, or a million years is unknowable since new discoveries are always possible. We use our current knowledge to do things like space travel...or automobile travel because what we know is good enough to allow it.

I'm not asserting anything except that new knowledge that changes or overturns what we know is always possible. For instance, we will definitely learn more about Relativity. That doesn't mean Relativity is wrong, just incomplete. The same idea holds true for all scientific knowledge. Such humility is necessary if we are to continue learning.

Sorry if I was less than clear.