They’re also more convenient — I make my coffee and tea at home the vast majority of the time, but now, I pour it into one of the few reusable mugs I tested for this story whenever I want to ...

It's amazing how quickly a cup of coffee can go from "elixir of life, savior of mornings" to "undrinkable tepid swill." But that's exactly what happens if you step away from your mug for just a ...