MarkT said:
when you say, 'It means to explain whether there is or isn't a Coke in the fridge', I have to ask you what you mean by 'it means to explain'? How does your sentence make sense? You're explaining what to whom? How are you explaining whether something is or isn't before there is anything to explain? If you put a six pack in the fridge, then it's not a hypothesis. You know you put it there. No explanation as to how it got there is necessary and whether there is or isn't a can left isn't an explanation. It's a question.
Science is in the business of answering questions. The claim that there is a Coke in the fridge does not address how the Coke got into the fridge. Whether there is or isn't a Coke in the fridge is a question, and how it got there is another question. My analogy was only about the former. It really shouldn't be that hard for you to imagine the scenario where I might not be certain that there is a Coke in the fridge.
The Coke in the fridge analogy was the simplest type of question I could come up with on the fly to demonstrate what falsifiability is all about. The question of whether there is or isn't a Coke in the fridge is absolutely a scientific question, and science addresses yes/no questions all the time with 100% accuracy.
Here's an example of another question that I think you should easily accept as a scientific question because the topic is not mundane (please note: I am not a physicist, and I don't even know if this experiment has even been performed nor whether it is an adequate test of time dilation, but it should serve as an example of a scientific question that could theoretically be answered with certainty): according to special relativity, time should slow down as you move faster. But maybe Special Relativity is wrong, and time is absolute and therefore not relative to one's velocity? One could easily ask the simple yes/no question: does time slow down with increasing velocity? You could make a hypothesis that time does indeed slow down because you have reason to believe that Special Relativity is correct. You could test the hypothesis by putting an extremely accurate atomic clock in a satellite that travels very very rapidly around the earth while its perfectly synchronized counterpart stays on earth. After bringing the satellite down, you could check and see that, in fact, just as Special Relativity would have predicted, less time elapsed on the atomic clock that was orbiting earth than on its earthly counterpart. The experiment can be repeated, and if the same results are obtained, then a perfectly scientific question is answered with 100% certainty: the passage of time is relative to one's velocity. Thus, the claim in this case has been verified. That doesn't make it false! That makes it true!
Here's the Coke in the fridge analogy again: Since I put a 6-pack of Coke in the fridge a few days ago, and nobody with access to the fridge drinks Coke that much, I think that there is at least one Coke in the fridge. But maybe there were visitors last night who drank it all? Is there a Coke in the fridge? I can hypothesize that there is a Coke in the fridge because I have reason to believe that, in fact, there probably is. I can test that hypothesis by opening the fridge and looking inside. I can answer the question with 100% certainty: there is not a Coke in the fridge. Thus, the claim in this case has been falsified. That doesn't make it true! That makes it false!
Look at the similarities between the 2 examples. They are both scientific claims. If you still disagree, then I have nothing more to say to help explain how the Coke analogy represents an example of a mundane but scientific claim. I will remind you that several posts ago you got this whole discussion started by sarcastically applying the concept of falsifiabilty to the mundane claim of whether scientists exist, so my mundane Coke in the fridge analogy really shouldn't be so mysterious or inappropriate to you.
You are correct that science does address much more complex and difficult questions, but please remember that I chose the Coke analogy as a simple one to address your misconceptions about falsifiability.
MarkT said:
Scientific claims can not be 100% proven; ie. they must be falsifiable. So it's not like claiming there is a can of Coke in the fridge. That sort of claim can be proven 100%. Scientific claims are like how the universe was created. Unless you created the universe, you can't know. You can only guess. That's what a hypothesis is - a guess - an explanation that seems true.
Some scientific claims can be proven with certainty. A falsifiable claim is one that can be tested so as to determine if it is false; ie. there is a way to test if the claim is false. A falsifiable claim may not be falsified, particularly if it is true. Falsifiabilty does not mean that one has to be able to find a way to show that a claim known to be true is actually false. As before, if I haven't yet been able to make this clear to you with the simple analogies I have used, then I can do no more to clarify the matter
A hypothesis is an assumption.