I highly recommend Manna by Marshall Brain - http://marshallbrain.com/manna1.htm http://marshallbrain.com/manna1.htm - He looks at how this may play out, with s

I highly recommend Manna by Marshall Brain - http://marshallbrain.com/manna1.htm http://marshallbrain.com/manna1.htm - He looks at how this may play out, with several variations on the theme throughout a single storyline.