As wildfires rage on the West Coast, air quality nationwide suffers. Satellite images show smoke and soot traveling all the way from California and Oregon to the Atlantic Ocean. Not surprisingly, the demand for air purifiers is surging. The principles of supply and demand ensure prices will rise as availability shrinks. Like the great...
Anyone who knows me knows that I love a 2×2. These graphs—composed of two axes, divided to make four quadrants—are known for simply and clearly comparing two variables. I first learned about the 2×2 in graduate school and have been using them ever since. In fact, several of the books I’ve helped to write,...
Haiti catapulted onto the international stage last week when its president, Jovenel Moïse, was assassinated in his home by a group of gunmen wielding assault rifles. His wife, Haitian First Lady Martine Marie Étienne Moïse, was wounded in the attack. This latest tragedy plunges Haiti further into chaos with shootouts in the streets, widespread...