UNIX is simple and coherent, but it takes a genius (or at any rate, a programmer) to understand and appreciate its simplicity.
The only way to learn a new programming language is by writing programs in it.
I've done a reasonable amount of travelling, which I enjoyed, but not for too long at a time.
Pretty much everything on the web uses those two things: C and UNIX.
For books, I don't read much fiction, but like travel essays and good pop-science.
Some consider UNIX to be the second most important invention to come out of AT&T Bell Labs after the transistor.