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,...
With less than 10 days until Christmas and the anticipation of a heavy snowfall, our household is in full Christmas mode. We’ve decorated the tree and hung an excessive number of lights throughout our home. We’ve splurged on cookies and hot chocolate as after-school snacks. We’ve listened exclusively to holiday playlists. And I’ve rediscovered...