Cause and Effect, when Time Machines are about, are rather awkward concepts. - Stephen Baxter

Maybe we should gather a few more facts before wasting our time speculating.

With his eland meat Brow was able to reinforce his political position among the men—and buy access to the women, which was ultimately the only purpose of his endless battle for dominance.

He dug into the ground until he came up with a stone the size of his thumbnail. “—if the universe was the size of this rock, then each star would be the size of a quark.”