Choose Freedom. Do what the Fuck you want. The WTFPL is a very permissive license for software and other scientific or artistic works that offers a great degree of freedom. In fact, it is probably the best license out there. This site provides information on how to make the most of the WTFPL
There are many free and open source software licences, and while they all broadly attempt to facilitate the same things, they also have some differences. Some of the major differences can be grouped together into categories, and this document acts as an introduction to these categories. Having read this document, you should be able to understand which decisions you should take in order to select a licence for your code.
Open source licenses grant permission to everyone to use, modify, and share licensed software for any purpose, subject to conditions preserving the provenance and openness of the software.