> **Possible Duplicate:**  
> [What experiment would disprove string theory?](https://physics.stackexchange.com/questions/15/what-experiment-would-disprove-string-theory)  

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A hypothesis without hard evidence sounds very much like philosophy or religion to me. All of them tries to establish a functional model explaining how the world works. In my understanding, string theory is an unprovable theory. What differs string theory from philosophy or religion?