 Money news at 10 and 40 past the hour brought to you by PenFed. Great rates for everyone. Here's Greg McBride. Don't believe these myths about how to improve your credit. I'm Greg McBride with thebankrate.com personal finance minute. Credit building is filled with bogus advice, so don't be too quick to believe what you've heard. For example, you may think that closing old accounts will boost your credit score.