- The shell of tortoises optimize material use for a curves surfact via hexagonal subunits and filler shapes
-flat hexagons will only interlock in a flat plane; they cannot be combined to enclose a space. A tortoise used hexagons in the center and then are bounded by pentagons which fuse to give a straight edge.
CAPSID PROTEINS SELF-ASSEMBLE TO FORM STABLE SHELL
- Minimalish free-energy structure and components that could find application in nanoscale scaffolding and templated self assembly.