Yep, once it's done it can just navigate to the nearest acetone reservoir in the body.

"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.

I downvoted your comment for the following reasons:

1. If you had read/comprehended the article you would understand how they plan to address this concern.

2. Really, even without reading the article, your comment just shows a failure of imagination. It's really not hard to see how this early prototype might be developed into more mature, useful applications.

Thank you for sharing your reasons for downvoting, but you're wrong. I did read the article, I do understand their plans and I didn't have a failure of imagination. It's cool tech, and I made a flippant joke in response to someone's comment.

Demoing that you can (partially) dissolve something in acetone or even water is not terribly impressive, even if their self-folding and mode of locomotion is pretty cool.

Ah I didn't really think of that - perhaps it was my own evil nature projecting onto the project!