http://sciencewise.anu.edu.au/articles/timbers
http://www.psmicrographs.co.uk/balsa-wood-structure--ochroma-pyramidale-/science-image/80200232
http://www.sciencephoto.com/media/118352/enlarge#
http://www.astrographics.com/GalleryPrintsIndex/GP2130.html
More about balsa:
http://students.iitk.ac.in/aeromodelling/basics/balsawood.html
http://www.youtube.com/watch?v=er_zCOuWlYE
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