I value learning new languages, especially as I have yet to find a very good one. Some are pure and beautiful like Scheme, but if you asked me what single language I would take to a lonely island with me where I was stranded, it would still have to be C.

To those here who would like to have some guidance diving into other languages I can recommend these two books:

Bruce Tate: Seven Languages in Seven Weeks https://www.amazon.com/Seven-Languages-Weeks-Programming-Pro...

Bruce Tate: Seven More Languages in Seven Weeks https://www.amazon.com/Seven-More-Languages-Weeks-Shaping/dp...

You can work through them in <4 months, and then we can talk again whether you found it useful (I did).

You might enjoy something along the lines of Seven Languages in Seven Weeks: A Pragmatic Guide to Learning Programming Languages. https://www.amazon.com/Seven-Languages-Weeks-Programming-Pro...

Seven Databases in Seven Weeks: A Guide to Modern Databases and the NoSQL Movement http://www.amazon.com/Seven-Databases-Weeks-Modern-Movement/...

Not the kind of short cut book that it may lead you to think. The book is a brief introduction to modern database types and what are their characteristics, what are their use case, and why you should choose it over other database types.

Seven Languages in Seven Weeks: A Pragmatic Guide to Learning Programming Languages (Pragmatic Programmers) http://www.amazon.com/Seven-Languages-Weeks-Programming-Prog...

Similar book as above, but introduces you to 7 different programming languages. The focus of the book is not on how to use each language, but to explore the different programming paradigms introduced by each programming language. (prototypical inheritance, functional programming, logic programming, object-oriented programming)