    Sentence & 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 itis an entire terracotta army of Chinese  the next) it is a skull, ¢gxcavated from the  Olduvai Gorge, that compels anthropologists  (once again) to revise their guesses about the  earliest stages of Homo. sapiens sapiens vs  hominids.    Sentence 2: We already know everything there  is to know about our past, nothing can ever  change that.