Three years after 3M Co.'s splashy entrance into the world of haute couture lighting and wall design, the maker of Post-it notes is embarking on a major expansion — a new, three-story design center at ...

UPDATE 1:25 p.m.: 3M officials say employees are returning to work after they were evacuated at one of the buildings on its Maplewood campus Monday morning. According to a company spokesperson, a walk ...