In a brain, dissolvable electronics monitor health and then vanish: The new transient sensors harmlessly melt away after wirelessly transmitting info.

So no, you can't be "skeptical", because we fucking know what it's made of, and you would know that if you'd taken the effort to actually read, instead of scaremongering.

I'm just taking a moment to appreciate the unearned smugness of your post.

lactic acid (the stuff your muscles produce, too)

Is your brain a muscle? Just because something is made by your body doesn't mean it's "safe" to just go throwing it around other parts of your body. Hey you want to put stomach acid up there too? Why not, it's made by your stomach! Do we have any research that shows that the presence of lactic acid in the brain is safe? Has there ever even been an experiment addressing the effects (potentially long-term) that lactic acid might have on the brain?

glycolic acid, which is used in many skin care products.

Is the brain your skin? How dull do you have to be to not realize that putting something on the body's first layer of defense against pathogens is different from putting it directly into the body itself. Hey why not drink hand soap, it's used in thousands of establishments world wide with no adverse affects!

silicon (and silicon oxide - sand), which is harmless unless you get it into your lungs.

I'm glad that you acknowledge there's a potential danger in taking something that is not normally inside of the lungs inside of the lungs. Now why can't you see that there's a potential danger in taking something that's not normally inside the brain and putting it in the brain.

(on a side note - I hate sand. It's rough, and coarse, and it gets everywhere.)

magnesium, which people buy tablets of to get more of it!

Holy shit, PEOPLE are buying it. Well why didn't you say so earlier!

I'm not even criticizing the article (the actual scientific paper hyperlinked in the submitted article). It actually seems like a promising new technology that has the potential to really help people (although 4 years seems a little ambitious for conducting human trials). But the arguments you provide are hilariously poor, which is ok I guess because this is Reddit and not an academic journal. Just don't go knocking skepticism, the concept which lies at the core of science itself, if you don't provide better arguments.

/r/gadgets Thread Parent Link - arstechnica.com