Occam's razor: Simpler explanations are more likely to be correct; avoid unnecessary or improbable assumptions. Dalton's third rule: Eliminate emotion from human response; so as to mitigate the effect of emotional response by the human recipient. Hanlon's razor: Never attribute to malice that which can be adequately explained by stupidity.[4] Hitchens's razor: What can be asserted without evidence can be dismissed without evidence.[5] Hume's guillotine: What ought to be cannot be deduced from what is.