Most of us have a basic sense of what Medicare is: health insurance for older people. But the components of Medicare, and the expanse of its coverage, are often more complicated than beginners realize. Different parts, different enrollment options, some things covered, some things not- an array of terms that can confuse and confound. How to understand it all? Perhaps you’d like a glossary- well, US News and World Report has just published one. Read it Here. And do you carry around your Medicare card? You might want to re-think that. Find out why Here.