The Luz Bone
I am going to present statements in Chazal, followed by a discovery that is currently en vogue among paleontologists.
I will leave it to you to draw your own conclusion.
When you draw the inevitable conclusion, you most likely will agreee that this is the closest anyone has gotten to identifying what Chazal were talking about, and you will be reminded of the dictum
סוד ה’ ליראיו.
סוד ה’ ליראיו.
From Beis Vaad L’Chachamim, here.