/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: asmar88 https://public.slidesharecdn.com/v2/images/profile-picture.png I am a physics and chemistry teacher in an IB school teaching grades 11 and 12 ·É·É·É.°ì´Ú²õ.²õ³¦³ó.²õ²¹/â€�