That is one of my favorite books too.
That Heinlein invented the water bed is rather well known.
The fact that he invented the 'concept' of the hydration system(camelback, etc...) is not well known at all.
I think that is because it was not implimented until MANY years after this book was published.


Edited by jamesraykenney (09/23/04 08:31 AM)