"Learn to code"-type book for students?

Hey, all.  I'll admit it: Ruby's my favorite language, at least in part 
because concepts that had been difficult or overly abstract in other 
languages were straightforward concepts in Ruby.  And now, well, I'd 
like to share the fun.  But I had ~25-odd years of hacking and slashing 
in various languages before I went down Ruby Road; what I'm looking for 
is an introduction-to-programming type of thing (book, website, 
whatever) that happens to use Ruby, *not* simply a book aimed at a 
programmer who's looking to learn Ruby.  Basically, one that starts with 
simple challenges (increment a variable; figure out what use modulo is, 
or #to_int, etc., etc.) with Ruby as the fabric that ties these 
together.

Does such a beastie exist?

Thanks!

-Ken

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