Why do we call medicine 'science?'

Cassie had another bout of stomach problems last night. Always a treat to come home to. Hoped it would pass, but she continued to have trouble this morning so it was off to the vet...

Who could tell me nothing definitive. Best advice? Some medication to calm her GI-tract and change her diet and see if that fixes it. And for this I paid $62.50.

[sigh]