Good one, BM.

Here is one.

Why is silk so soft ?

The secret of silk’s softness and other properties lies in silk protein, fibroin, it’s crystallization and spinning.

For more of the secret -both reveled and what remains, here is a Nature article:

Biomaterials: Silk's secrets

Edward Atkins

Nature 424, 1010 (28 August 2003) | doi:10.1038/4241010a

http://www.nature.com/nature/journal/v424/n6952/full/4241010a.html

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