first-principles thinking should be deployed where it matters the most. To mop the mist collected on your mental windshield in those areas and expose the invisible rules governing your life, spend a day questioning your assumptions. With each commitment, each presumption, each budget item, ask yourself, What if this weren’t true? Why am I doing it this way? Can I get rid of this or replace it with something better? Be careful if you find yourself coming up with multiple reasons to keep something. “By invoking more than one reason,” observes author and scholar Nassim Nicholas Taleb, “you are
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