During their excursion last week around the Swiss alpine town of Zermatt, Los Alamos residents Bill Priedhorsky and Melissa Bartlett hike down from the top station of the Gornergratbahn, the highest train in Europe, with the Matterhorn in the background. 2019 LANL summer student Clara Rittman, center, joined Priedhorsky and Bartlett on the way from her home institute in Freiburg, Germany, on the way to a conference in Milan. Courtesy/Bill Priedhorsky

View Sept. 22 from above Zermatt, Switzerland. The Breithorn (13,661 feet) on the right, Castor and Pollux in the middle, and the Grenz Glacier between them, along the Alpine ridge between the Matterhorn and Monte Rosa. Bill Priedhorsky of Los Alamos in the foreground. Courtesy/Bill Priedhorsky