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Pi is an introduction to the extraordinary mystery of math, say some. Others say pi is not special and needs to be reformed.

The consensus going into Tuesday's primaries is that last week's confrontations at Trump events will alienate some potential supporters but also galvanize the heart of the Trump movement.

Last week, Brietbart News was promoting Michelle Fields' interviews on major TV networks. Last night, she resigned from the site, along with editor-at-large Ben Shapiro.

A hiker in Israel found a gold coin so rare that Israeli archaeologists say there's only one other with the same symbols known in the world.

The surging voices of two female lead singers create the signature sound of the five-piece band Lucius. Rock critic Ken Tucker says the band's new album, Good Grief, is often lovely and well-crafted.

Ahead of more peace talks, President Vladimir Putin said the objective of the military intervention had "been fulfilled." President Obama spoke with Putin and said he welcomed the move.

If you say, "I want to kill myself," they give a national hotline. But digital assistants are not as helpful if it's abuse or sexual assault.

The International Crisis Group released a report Monday about violent extremism in the Middle East. The report studies how al-Qaida and ISIS have been able to thrive in the region, and how the U.S. has responded. NPR's Robert Siegel speaks with lead author of the report Richard Atwood.

Hillary Clinton is looking to hold off Bernie Sanders in Tuesday's major primaries, but Sanders is looking for momentum after his surprise win in Michigan last week.

Former Flint, Mich., Emergency Manager Darnell Earley is among those to testify before Congress on Tuesday about the actions leading up to Flint's water crisis.