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2. AskNature (2008b) Spiral fibers strengthen tree trunks: whitebark pine.
http://www.asknature.org/strategy/e70b6b7753773a7177fe8358ec26ed2c
3. AskNature (2008c) Wing scales diffract and scatter light: Morpho butterflies.
http://www.asknature.org/strategy/1d00d97a206855365c038d57832ebafa
4. AskNature (2011) Vitalis pet bottle.
http://www.asknature.org/product/b5dc4030c48e41b03442d34aecdf46b4
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