Today I've been doing some hunting, however not too much gathering. I've been hunting a book. The book should - according to some pretty trustworthy sources - be in the library. Or possibly in my professor's office. Or possibly in my supervisor's office. Or possibly in my professor's home.
Step one: Search the university library. Nope, the book has been borrowed.
Step two: Search the department library. Weeell... Yes. But no. It should be there. However... Well, let's just leave it at me having made the librarians look for it for over an hour and we still didn't really find out on what shelf it ought to have been placed, shall we?
Step three: Ask supervisor. Well, no. She has another book by the same author though. Close, but no cigar.
Step four: The office of my professor... Ah, this is interesting. Some years ago, Chaos set up camp in there, and has refused to leave ever since. We could soon conclude that there was probably no book to be found in there either. Actually, there were heaps of books, but unfortunately, I'm a picky girl. I wanted a particular one. He promised to have a look at home, maybe it's there somewhere...
I have a distinct feeling that this book has not simply been borrowed, or mislaid. It has vapourised. Most likely something to do with atoms and half-life.
Approximately 27 years, what material would that be?