This Friday in This Blog's History I bring back to you a discussion on the definition of the word 'theory'. Too often, the general public thinks a scientific theory is a simple guess by scientists. No, it is not. A scientific theory is much, much more than a guess. It's no different than a scientific law (minus the math) and is backed up by a large amount of observable data.
For full details check out the original post.
What is a Theory?