Toward the end of my stay in the United States, I noticed myself starting to get shrill again when discussing Wall Street, mine disasters, oil spills, politics, and ambient knuckleheadedness. Late yesterday my plane touched down in Mexico. I took a deep breath, enjoyed an hour's ride back to San Miguel in a big, gas guzzling Suburban on a beautiful afternoon. Voila! The register of my voice returned to what had become normal over the past year.