DINA GIESLER: The best way to describe a crown is it's a cap that we put on a tooth, and it's probably the best procedure we have to save a tooth. A patient needs a crown when the tooth has been ...

The battle to command the largest market cap among U.S. exchange-listed companies is a lot like Game of Thrones. Apple (NASDAQ: AAPL) regained the crown this past summer, after two other ...