What specifically do they learn? Much more than we can imagine. Dogs can identify who passed by, what was the feeling the person was feeling at the time and even if he was or was not healthy. Archeology and science always go together to discover our real origins, how the world used to be, what its vegetation was like, how, why and when species came to an end, among other things. And it seems that whenever you think you know “with certainty” something, a new discovery emerges and changes everything.