Use the form available on the News Archive page to define your search criteria. It is best to try several searches before viewing articles. Then enter words and phrases that you expect to be included in the articles you're seeking.
Source is the author of the story.
You can search for dates using many different forms. A month is considered 30 days from the current date, a year 365 days. You can search the textual date by using many different forms as well. Articles are normally listed in reverse chronological order, or most recent first. You can also choose to list articles in chronological order, or oldest first.