Please define cancer. You seem to be implying it is a single disease which can be cured if we find the "right" treatment. It is actually a term used to describe a very large set of diseases which usually have little in common apart from them all involving unregulated cell growth. And yes I am a researcher involved with anticancer drugs.
The motor was indeed made from 18 atoms. It was butyl methyl sulfide. 13 + 4 + 1 = 18 atoms. The car just incorporated these molecules into a different larger molecule. Why the hate on nanomachines?
Funny thing is I have good hearing and eyesight but I still don't enjoy most movies. Anyway, sorry that you have to pay to rent the headphones, but no one is putting a gun to your head to go to the movies.