Here’s what the law says about challenging election results

Clip: 10/20/2016 | 8m 3s | Donald Trump suggested that he may not accept the validity of the election results. (8m 3s)

Petraeus: Bigger challenge to come once Iraq retakes Mosul

Clip: 10/20/2016 | 8m 56s | The operation to regain control of Mosul from the Islamic State is in its fourth day. (8m 56s)

Putting policy in context at the final presidential debate

Clip: 10/20/2016 | 4m 41s | Unlike the first two debates, the final debate saw a discussion focused on policy. (4m 41s)

Rural North Carolina voters say their struggles are ignored

Clip: 10/20/2016 | 8m 52s | Why America's poor are rarely factored in political conversations. (8m 52s)

This casting director likes you for your idiosyncrasies

Clip: 10/20/2016 | 3m 2s | A Brief But Spectacular take on what David Rubin sees as the most illuminating auditions. (3m 2s)

Why some environmentalists don’t support this carbon tax

Clip: 10/20/2016 | 9m 26s | In Washington, economist Yoram Bauman is waging a war against carbon emissions. (9m 26s)