A scientific theory may refer to some feature of the natural world observed and established by experiment. It is not 'proof', but it is more than 'belief', and it is definitely not 'final'.
It is perfectly possible to replace one scientific theory with another, but you cannot replace a scientific proof by another proof. The first proof was wrong. Or maybe the other one isn't right.
Confusing. But the confusion can easily be cleared up by a little trial and error at home.
If you twist the top of the toothpaste anticlockwise, it almost certainly will not come off and you will very probably not do that again.
However, that does not 'prove' that the tops of all toothpastes cannot be removed anticlockwise. You can never be absolutely certain after one hundred or one thousand tests. And you don't have time for that.
You can then of course start to believe the tops of toothpastes always come off clockwise and say to others it's a fact.
And that's what causes all the trouble.
You can even say it's a scientific law and been proved. Though the fact is science has proved no such thing.
Neverthsless two nice things encourage you to stick with the belief. First is if you refuse to believe science and its methods, you can believe anything you like. Second, should the top of a toothpaste open anticlockwise anywhere ever, you can say that proves science is wrong.
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