Warner, I think they are very similar to cancer cells. The cancer cells have only learned to multiply rapidly and to rob neighboring cells of their nutrition. They provide no known useful service to the host.
Harold

if we could only train them!

Even weeds can add something to natures garden, we are all unique it is just sticking to that .. WA offers a great opportunity to us all

:))))

In my garden, I am the one who determines what's weed and what is not

And a post on WA has the potential to change people's lives in a matter of seconds or years. Awesome words Warner!