The title should say "lightest metal structure". Lithium is the lightest metal. (Though technically Li-6 isotope is even lighter) http://scitation.aip.org/con

The title should say "lightest metal structure". Lithium is the lightest metal. (Though technically Li-6 isotope is even lighter) http://scitation.aip.org/content/aip/journal/jcp/27/5/10.1063/1.1743927 http://scitation.aip.org/content/aip/journal/jcp/27/5/10.106...