Scientific evidence doesn't depend upon what I think. Physics doesn't change based on what I think of it.
Well, thank goodness to see you saying that!

Oh and thank goodness that's not what I'm presenting. I'm speaking about all humans ... (not just what you think .. (ie: as an individual member of our species).
What
you think I said, is all just yet more evidence of your beliefs obscuring what I've been saying all along, however.
Isaiah 41:10 said:
Your question is like asking me how I can be certain if gravity exists. It doesn't really have anything to do with what I think because evidence which demonstrates it's reality has predated me and exists independently of my mind.
Do you really think Australopithecus, for eg, had meanings for any of:
'gravity, evidence, reality predated me' and '
exists independently of their minds'? Highly unlikely .. therefore its more likely that would be just modern-day
you claiming all those things existed going back in time ... and therefore, more evidence of
your mind conceiving those things as existing independently of Australopithecus during their era (and Homo Sapiens, during ours). How would
any of that,
in any way be evidence for those things existing independently from you, them, or us?
And, (presumably), you gained the knowledge behind the model you outline above, by way of a well reasoned and evidenced, scientific method which produced restrospective, model based predictions, (or postdictions). How can any of that obvious work done there by others, possibly be a demonstration of actual, (true), mind independence? Its completely nonsensical to claim that.
Time for you to pay some credit to all the humans for coming up with all the concepts you, yourself, keep using all the time, rather than just your
pretending it never happened that way.
Isaiah 41:10 said:
If science cannot demonstrate the existence of things beyond our perception, do you know for sure if the sun was around 100 years ago? No? yet you most likely think it's a rational position to hold, that it was around, do you not?
Yes .. 'the Sun' is (along with time) are objective models in science, (they are
scientific perceptions, if you like), which can be tested by anyone .. The results of testing the Sun/time model there, produces clear data/evidence demonstrating consistencies (or otherwise) between them and that model/its predictions and *zip* evidence for anything existing independently from the scientific mind obviously doing the testing of, and conceiving of that model.
You'll also notice that science never claims any conclusions as
'knowing {anything} for sure'. Doing so would remove the
'contextual and subject to change' understanding we have, which distinguishes science from philsophical (or religious) beliefs.
If such a claim of
'for sure.. {etc}' knowledge, is made on behalf of science, it ceases to be science, because science can't work that way in achieving its overall purpose of demonstrating practical usefulness (utility value). Such claims are thus based upon beliefs (religious or otherwise).