By AMALIA GLADHART

Anna was slow to do the math. B saw it instantly—what might be left after everything else melted away. White captions flickered in the dim exhibit hall. 

B had turned thirteen that fall, ready to join Anna on a trip that was part research, part treat and adventure, the first time they had left the country together, alone. A few days in Rosario (a university lecture, an interview with a playwright), the long bus to Buenos Aires. Invited to contribute to the itinerary, B asked to see glaciers; Anna booked a half-day trek across the ice. 

Passengers all around them had clapped when they landed in El Calafate. “That’s so sweet,” B said, joining in. Anna clapped, too, hoping it was thanks, not bald relief. The tiny airport was rapidly navigated. Advertisements lined the baggage claim, placed to catch a teenager’s eye. “They have an ice bar at the ice museum,” B said. “Can we go? There’s a free shuttle from the tourist office.”