Ten years after “Mad Men” wrapped, stars Jon Hamm and John Slattery still have fond memories of the landmark AMC drama. Well, perhaps except for the smoking. And the onion water. Reuniting Saturday at Austin’s ATX TV Festival. Hamm and Slattery spoke to moderator Noah Hawley (who worked with Hamm on the most recent season …

A strong geomagnetic storm may bring the aurora borealis into view as far south as Colorado Sunday into early Monday. Here's when and where to look—and what might get in the way.