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From Wikipedia:

• Occam's razor: When faced with competing hypotheses, select the one that makes the fewest assumptions.
• Popper's falsifiability principle: A theory can be scientific only if it is falsifiable.
• Hanlon's razor: Never attribute to malice that which can be adequately explained by stupidity.
• Hume's razor: Do not multiply necessities without good reason.
• Hitchens' razor: the burden of proof or onus in a debate lies with the claim-maker, and if he or she does not meet it, the opponent does not need to argue against the unfounded claim
• Newton's flaming laser sword: If something cannot be settled by experiment then it is not worthy of debate.