But do they also cause cancer?
That's been a debate in the medical community for almost as long as mobile phones have been around.
Just click on the monitor to hear the rest of my Notebook.
Donald Trump's top priority this week is not to campaign for his ticket or his party -- but to drive a wedge between Hillary Clinton and Bernie Sanders. Major Garrett reports.
The DNC is beginning with a developing scandal -- and e-mails are at the center of it. It's forced the chairman of the Democratic National Committee to announce that she is stepping down at the end of the week. Nancy Cordes has more.
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