/u/HeirApperent's posts in /r/askscience
Are we just “lucky” that Magnetic North is very close to True North, or is there something more behind the reason?
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In the same way that commodities (wheat/ corn) are considered the same standard quality in the market, are chemicals such as nicotine considered to all be the same “quality”? Can chemicals at their base level have different “quality levels”?
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