A robot made from magnetic fluid can be made smaller, thinner, or directed to break up with special magnets, which could be useful for delivering drugs into the body
https://www.newscientist.com/article/2338260-liquid-robot-can-split-into-tiny-droplets-and-reform-into-a-blob/
* targeted drug delivery * Xinjian Fan * Pietro Valdastri * Bradley Nelson * Hamidreza Marvi * lab-on-a-chip devices * DOI: 10.1126/sciadv.abq1677