simetria in natura- proiect etwinning

http://www.scienceinschool.org/print/406
http://pxlshot.ro/concurs/4259-simetria-in-natura
joc test
http://www.adrianbruce.com/Symmetry/
http://myeducationstuff.com/Symmetry/optics/optics.htm
http://myeducationstuff.com/Symmetry/4.htm