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Iraq's national security adviser, Moaffak al-Rubaie, talks to Melissa Block about the violence that has engulfed Iraq after yesterday's bombing of the Shiite Golden Mosque in Samarra.

University of Massachusetts Amherst political scientist Alexander Theodoridis talks about dehumanizing language in politics, what it can lead to and what we can do about it.

Political figures who had contact with the president in the past week are being tested — and reporting negative results. Doctors sound a note of caution about what those results indicate.

Tens of millions of Americans are forced to live with wildfire smoke now every year. New research shows that it's more invasive than previously thought, infiltrating homes, schools and offices.

Missouri's last clinic that provides abortions is close to losing its license. Oklahoma communities are in a standoff with the raging Arkansas River. New election technology sparks security questions.

A Walmart employee opened fire in a Virginia store late Tuesday during what are normally popular pre-Thanksgiving shopping hours. It's the second high-profile mass killing in a handful of days.

The search continues for over 1,000 people who are still unaccounted for after the wildfires on Maui. Family members say they are feeling frustrated with the chaotic process.

Marking 100 years since its founding, China's Communist Party is trying to keep its revolutionary spirit alive. How? Training its cadres at party history boot camp.

It's Pi Day, the day regular people gawk at the brilliance and beauty of a mathematical constant. We focus on why pi still captures our imagination thousands of years after it was first calculated.

Many people with Alzheimer's suffer medical and mental health issues that have nothing to do with memory loss, including slow healing, incontinence, paranoia and depression.