Mysterious disappearances... should we keep looking?

And by "we," I mean someone else.  I'm kinda busy lately.



But what made me ask the question was this article at CNN about Jimmy Hoffa, another tip led to another fruitless search for his body.  Should we spend the public's time and money looking, after almost 40 years?



You tell me.



It did get me wondering about other mysterious disappearances, though, and a little research dug up (hehe) a few I didn't know about.  And as a mystery writer, you can bet some of these got my ima...