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Linux Mint Debian Edition officially released
(blog.linuxmint.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
And pretty hard to achieve, considering breaking Debian is borderline an endeavour.
I use "stable" not in the sense of "doesn't break", but in the sense of "doesn't change its behaviour".
Debian is rock solid, but Slackware is the most stable in the sense that it still looks and works pretty much exactly like it did 10-20 years ago.