Stu
I did earlier. Hypothesis, theory and the scientific philosophy that forms the backbone of any given piece of research.

Do you mean when you said -
What defines a scientific concept? Are you talking about a theory, hypothesis or perhaps a philosophical construct? Perhaps you mean a guess? Or a musing? Define sil vous plait.?
I thought you were being sarcastic.

All these are products of the human mind; attempts to bring some order and understanding to the actual observable evidence. None of them are something you can see in your back yard. Don't tell Steve Shaw who thinks that evolution is as real as the moon.