My main hobby is collecting other hobbies. Or it could be because I'm one. And then there's the whole Web site I maintain. That oughta keep me busy for the next several lifetimes. One of these days I'll have to look up the whole quote, but I haven't unpacked all my books yet.
Specialization is for insects.
And if you've gotten this far, you'll notice that I do ramble on a bit. One of my worst faults, I talk too much. Ya, in my spare time. To better understand MIT people, first understand their sense of humor. This is a good example .