In engineering carbon nanotubes are being proposed as a strong light material that will be useful in constructing space craft and nano particles are currently in use at St. Pancras Station London as part of the stations self cleaning roof<ref>http://www.skynews.com.au/health/article.aspx?id=278102</ref>.
+
Carbon nanotubes constitute a strong, light material that will be useful in engineering and constructing. Nano-particles are currently in use at St. Pancras Station London as part of the station's self-cleaning roof<ref>http://www.skynews.com.au/health/article.aspx?id=278102</ref>.