At issue is not only knowledge of the world but our survival as individuals and as a species. All the basic technologies ever invented by humans to feed and protect themselves depend on a relentless commitment to hard-nosed empiricism: you cannot assume that your arrowheads will pierce the hide of a bison or that your raft will float just because the omens are propitious and you have been given supernatural reassurance that they will. You have to be sure.
![At issue is not only knowledge of the world but our survival At issue is not only knowledge of the world but our survival Image](https://www.idlehearts.com/images/at-issue-is-not-only-knowledge-of-the-world-but-our-survival.jpg?x85372)