Kate Becker: Pulsars are like kitchen tongs — not pretty but essential

W hen you live in a tiny apartment, you must evaluate each new purchase according to a few simple rules: It must be practical, it can’t take up much space, and it has to do something — it can’t just sit around looking pretty.

Jeff Mitton: An introduced parasite in a wilderness

Trappers Lake, in the Flat Tops Wilderness, is known not only for its stunning beauty but also for its self-sustaining population of Colorado River cutthroat trout.