This article doesn't mention other work in the area. Other teams have done field work with autonomous self-powered vehicles powered by thermal differences. ht

This article doesn't mention other work in the area. Other teams have done field work with autonomous self-powered vehicles powered by thermal differences. http://www.jpl.nasa.gov/news/news.cfm?release=2010-111 http://www.jpl.nasa.gov/news/news.cfm?release=2010-111