How do you know when the news you read is true?

CNN, Fox News, the Associated Press and the Boston Globe falsely reported that a Boston Marathon suspect was in custody last Wednesday. Reddit and the New York Post identified the wrong suspects altogether.

The Associated Press confirmed Tuesday that the organization’s Twitter account had been hacked. A false post was published about an attack on the White House. The bogus post sent a tremor through the stock market. The Dow Jones Industrial Average fell briefly.

Today’s Question: How do you know when the news you read is true?