Bruce Sherwood, the co-author of Matter and Interactions, had a question for me when I saw him at the American Association of Physics Teachers conference not long ago: "What calculator do you use?" If ...

It's been more than 20 years since I bought a physical, hold-it-in-your-hand calculator. I've bought a couple of special-purpose calculator apps, but the very last one I bought was the TI-1726, which ...