Pennarun’s favorite structure is:

Snowflakes hexagonal struture

Snowflakes hexagonal struture

Source: http://en.wikipedia.org/wiki/X-ray_crystallography#mediaviewer/File:Snowflake8.png

Why?

Water is one of the simplest molecule on earth and essential to life. Well known molecule, it is in the same time a molecule that still not completely known when grouped with other water molecule. Snowflakes show broad number of structures, from which mechanical behavior will depend. Macroscopic mechanical behavior of snow, especially in montains, depends then only of the weak very small hydrogen bonds. In the same time not so weak as USA think to use it with wood fibers to build armor for warships as strong as metallic ones during the WWII. —Pennarun


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