"A firearm is best – I'm sure you've heard the expression 'Never take a knife to a gunfight.' But I also recommend Mace or tear gas, something you can use to get away. After all, it might be your hungry neighbor, who's not thinking too clearly, coming at you. If you can use a nonlethal way to deter him, that is awesome."
Mark Ruffalo's Good Life Formula
How Hollywood's greenest star found peace.
Plus: The New Whiskey Masters
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