This is how you serve science. Thanks to Tom Leinster. "This electronic version is not only free; it is also freely editable. For instance, if you would like to teach a course using this book but some of the examples are unsuitable for your class, you can remove them or add your own. Similarly, if there is notation that you dislike, you can easily change it; or if you want to reformat the text for reading on a particular device, that is easy too."

As far as I know, FreeBSD is more secure than most of the out of the box Linux versions(not considering jails). Does anyone know an article that illustrates this?

There is HardenedBSD http://hardenedbsd.org/, which is working on filling gaps between OpenBSD and FreeBSD security.

OpenBSD is definitely more secure out of the box than Linux.

I've heard the opposite. Although it's comparing to OpenBSD in this case, here's a good graphic that shows the exploit mitigations that FreeBSD provides by default: http://networkfilter.blogspot.com/2014/12/security-openbsd-v...