Small, exposed pieces of bones attached to a hip. OR, we can go your way: we just don't understand it!! Your argument is useable in every situation possible ( i.e. it's not raining. You just don't understand it), you realize this, no?
And, going from there, let's figure out how much we can advance mankind by simply stating "You simply don't understand it" to everything?
That have no use, or you just don't know what use they serve? And is it an actual hip and a leg, or is it just something you point to and say it looks similar.. Really. Tell us, what do the addenoids do (sp?). Cause my brother had his removed though specialists at IU med center admitted they're clueless as to what purposes they might serve. Right. The pretense is that you know; but, the reality is that you don't. Thank you for playing. Next.
Is it an advance to label something under the pretense that you know what it is. Or is it an advance to actually discover what it is. Two different tracks. Science is supposed to be in the business of reporting on the observable. If you don't know the answers to questions about what you observe, the idea is to make reasonable efforts at finding out the answers and if you can't - admitting it would be useful. But putting a label on something you don't understand and pontificating about what it might be, then selling that as the fact isn't science. Snake oil is a better term that leaps to mind..