NOVA: MAKING STUFF
'The overlapping scales of <a href="http://www.j-archive.com/media/2011-02-04_DJ_26.jpg" target="_blank">these</a> fish prevent algae from living there, & similar medical <a href="http://www.j-archive.com/media/2011-02-04_DJ_26a.jpg" target="_blank">material</a> may reject bacteria'
a shark