premise: Just when you thought it was safe to assume that we now know all we are ever likely to know about the past , someone digs another hole and unearths ( literally or figuratively ) some ancient one day it is a fragile scroll , found in a cave near the Dead Sea , that turns out to be pre-Biblical ; the next day it is an entire terracotta army of Chinese the next it is a skull , excavated from the Olduvai Gorge , that compels anthropologists ( once again ) to revise their guesses about the earliest stages of Homo sapiens sapiens vs hominids .
hypothesis: There are plenty more discoveries to be amde , fossils to be dug up , and history to be uncovered .