Science is based on TRUTH! Do you deny it? We do assume something to calculate something and in if you are a science student then you know what i mean and what did you say now? They don't need to provide me the right answer!!WHAT?? Then i just have to check someone post and say 'NICE POST! I AM TOTALLY AGRRE WITH YOU?!' If someone really want to post for the betterment of the conmunity then it is not a big deal to provide the right things though i was wrong for a word 'completely'. But one can't deny that it is commonly! And i wanted to provide that.