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When the Twin Towers fell, the FBI's top expert on Al Qaeda went with them.

Discover how cats first crossed from Asia into North America and became the top predators.

Follow Cassini's final days as it skims the cloud tops before plunging into the planet.

A crack team rebuilds a glider that POWs hoped to catapult off the top of Colditz Castle.

Get analysis on this week's top headlines.

As the highest-ranked team left standing, it's up to No. 4 seed UConn to restore order in a tournament that's been marked by wild upsets. But it's not the only team with a strong resume.

The United States has become increasingly polarized in recent years. New research published by the Carnegie Endowment for International Peace seeks to better understand what happens when democracies become ‘perniciously polarized’ — that’s when polarization has divided a society into two mutually antagonistic political camps, where each side sees the other as a threat to the country’s future. According to this research, polarization in the United States reached the level of pernicious in 2015 and remains so to this day.

Community leaders seek solutions as gun homicides spike in Philadelphia

Ehsanullah struggles with immigration law while seeking asylum.

Amna Nawaz talks with Julia Preston of the Marshall Project.