Honestly, not to be too critical of some ppls education level, but many are complete freekin math retards. They cannot do basic measure/calculation a 5th grader should know, and rely on "simple" math answers form other possible retards on the web. Not just math but also making sure you give your undivided attention to what you are doing. You cannot afford to be half awake when dosing potentially fatal substances.
Here are perfect examples of horror mistakes with slin and clen:
Unbelieveable 12ml of Humulin N OD:
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Discussion of the 1st post by others:
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300mcg of Clen OD and Emergency Room Ordeal:
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Learn some basic math skills/conversions ppl (you know who I'm talkin about), and pay attention to what you are doing as if you life depended on it! (it does).