Just how cold is it? It’s so cold that carbon in regular pencils can’t imprint an image on paper, while ink in pen cartridges just freezes. Pickers were using “grease” pencil—a crayon-like marker—to check off products they picked. It wasn't uncommon to misplace both the paper and pencil that they put aside to pick cartons with both hands. “It took a long time and it was open to errors,” recalls Dave Cillian, Pierre’s manager of operations.