If you have secondary progressive multiple sclerosis (SPMS), your doctor may have described it as “active” or “inactive.” You may be wondering what these terms mean and why they matter. “If we’re at a ...

In relapse-remitting multiple sclerosis (MS), people experience periods of high MS activity where they have more symptoms or imaging tests show inflammation. Between these periods, the condition might ...

A series of “hidden” geological hazards has been uncovered in the northern reaches of Yellowstone National Park, including active faults that could pose earthquake threats to communities in the area.