>>I saw something once, some sort of automatic thing that goes around your
>>land by itself, it has some sort of positioning system so it knows where 
>>to
>>go, can "see" how long the grass is and of course actually cuts it.  Never
>>needed emptying, got it's power somehow from the grass itself, and 
>>produced
>>this white liquid which was ok to actually drink!
>
> Is that the thing that also converts the grass into fertiliser and at the 
> end of
> its useful life can be rendered into a protein thingy that can be 
> consumed?

I heard this was the case, but the demo I saw didn't show this bit.

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