User talk:Yohan Duminda

January 2009
Welcome to Wikipedia. The recent edit you made to Biochemical oxygen demand has been reverted, as it appears to be unconstructive. Use the sandbox for testing; if you believe the edit was constructive, please ensure that you provide an informative edit summary. You may also wish to read the introduction to editing. Thank you. Alansohn (talk) 15:20, 27 January 2009 (UTC)