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You can't disprove anything? Do you know what the meaning of proof is?
It's a mathematical term, as logic, at the college level and above, is no longer contained in philosophy, but in mathematics.
In order to prove a proposition, it is necessary to use a method of proof. The three most common methods are contradiction, direct, and contra-positive.
We're gonna focus on contradiction specifically.
Given the proposition, one can use the contradiction to DISPROVE the opposite of the proposition, which PROVES the original proposition.
Disproving is actually much easier than proving, because there is so much bullshit out there that's easy to point out.
Example:
Prove 2+2=4
Suppose 2+2 != 4 (!= means does not)
By the law of addition we know that 2+2=4, which means:
4 != 4
This is not true, obviously, so we have reached a contradiction. Which means:
2+2=4
QED.
If something cannot be disproved why is the term used in science? This is from a USC website.
Towards the Future: Quantum Gravity
Einstein's theory of gravity has never been disproved until now (2004). Soon after it's completion, the theory of quantum mechanics was developed, a description of the world in very small scales. However general relativity seems to be incompatible with quantum mechanics and breaks down (theoretically). In most of the cases gravity is so weak that in so small scales it is ignored. However in the interior of a black hole, the huge amount of mass is not negligible. Also, this is the case at the early stages of the universe: ultra-condensed matter, lots of mass suppressed into quantum distances. At these cases a quantum treatment of gravity will be needed, although there is no way right now to test how exactly general relativity must be modified.
The other 3 forces of nature have been modified and work well under the quantum regime, and only gravity escapes for the moment. The complete theory of gravity will include eventually somehow the quantum principles; this theory of quantum gravity is the greatest challenge of our understanding of the world today.
http://www-scf.usc.edu/~kallos/gravity.htm
Maybe you would say that what was done was not that something was disproved but instead proved to be wrong ... but that is just a matter of semantics, isn't it?