Well, it's a "theory", like Einstein's Theory of Relativity. We too often misuse the word "theory" when we mean "hypothesis". This is a pet peeve. A hypothesis is a testable situation, where one set of results indicates the hypothesis is "proven" and the other set of results when the hypothesis is wrong.

A scientific "theory" fits all the known facts and can be used to predict behavior under known conditions. If it fails to predict correctly then it is suspect and must be examined for the conditions that caused the failure. If those conditions are not external, then the theory must be revised or abandoned if revision is impossible.

Einstein himself said that a theory can have thousands of proofs, but just one failure is enough to invalidate it.

But without the Quantum Theory, we wouldn't be typing to each other on computers, because semi-conductors could never have been conceived.

(This doesn't invalidate the use of Borates to inhibit algae growth.)