Experiments

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  1. Can anyone tell me, what “rubbing alcohol” is? I´m a teacher from Germany and I usually use Ethanol for an experiment like that. I could not find any translation of rubbing alcohol, even the english teachers were not able to translate. Can anybody give me the formula?

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    Rubbing alcohol is same as normal laboratory alcohol.. i used ethanol for this experiment in my college.. :)
    Check this too >> http://globaltutor.blogspot.com/search/label/Genetics

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  2. How can they know the masses of the celestial bodies which are lots of light years away from earth?

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