A nano-sized electric motor and
http://www.newscientist.com/article/dn20863-single-molecule-is-tiniest-electric-motor-ever.html
Read the articles in the two links above.
First summarize the facts from the article in 4 clear and concise sentences.
Next, think about the implications of a motors being downsized to molecular dimensions. What kinds of applications would small motors have on the way we live today.