Having now read the book version of 2001: A Space Odyssey, I can now decisively answer a question that always bugged me after watching the the movie version, which was: what the hell happened to Hal? Why did he lose it and try to kill all the astronauts?
How an archaeological site in Turkey upended a conventional theory of how civilization developed.
These days, salt is so abundant that it’s easy to take it for granted. If you had lived in any other time in history, though, chances are that your relationship with salt would have been dramatically different.