Anne Heche is in a coma after a car crash. What to know about comas, how long they last.
Anne Heche is in a coma after a fiery car crash in LA last week. Here's what you need to know about comas, including how long they can last.

Anne Heche is in a coma after a fiery car crash in LA last week. Here's what you need to know about comas, including how long they can last.