Magnetic micro-machines made from liquid iron

Shining light through liquids containing iron nanoparticles has made microscopic springs and turbines that might have future uses in drug delivery systems and complex electronics.

RSC Chemistry World: 13 July 2010

TechNyou

It is a technically written story but interesting research becasue of its potential application even if it may be decades before such knowledge might be applied in any commercial sense.  However, it is still not anything resembling the infamous nanobot.