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It is important to exclude as far as possible any other systematic effects on this number other than the effect you are measuring . So , the way to get the effect you want in the maximum number of browsers is to bring the margin-left back to 0 , and then add 3px of padding-left . The most likely readjustment you will sense is a change in energy patterns , with feelings of more vitality and well-being , although there is often a period of adjustment during which you may feel lethargic or even nauseous for a while . It is where it is impossible to tell whether the difference between your two groups is due to the effect you are measuring or one of the systematic effects . If you would like to expedite your registration , I will be happy to fax you registration forms . It is harder to shoe you than to hurt you .