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"Making the entire robot dissolve in water is a bit trickier, but the researchers seem confident that it’ll be possible in the near future."

But if it dissolves in water how is it supposed to make it anywhere inside your body? There's lots of water in there.

Contact lenses are ruined by contact with ordinary water but the saline solution and water in our eyes doesn't ruin them.

Same problem, there isn't really any pure water in your body to dissolve robots in either.