Você disse Cristalografia?

Synopsis: Paul Andrade is a journalist and television presenter. In his program he interviews Nocturnal Conversations receives Professor Henry Onero for a talk about crystallography, the study of crystals. Henry talks about geometric shapes and symmetry axes that constitute the basic features for classification of crystals.
Source: Unicamp - M3, Mathematics Multimedia.
URL: http://m3.ime.unicamp.br/recursos/1188