[vladiliescu]

"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."

[jokr004]

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

[lawlessone]

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

[sp332]

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