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177: The Art of Maintenance
Plus, one of the greatest scientific leaps of our lifetimes, the three pillars of happiness, opti-ox technology, and good news on hepatitis B, crime in New York, conservation in Colombia, electric vehicles in China, and tiger populations in Asia.
![177: The Art of Maintenance](/content/images/size/w100/2022/07/Cropped-Roaring-40s-2-3.png)