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The top Republican presidential candidates wrapped up another debate Tuesday night and now turn to the nation's first two primary states: Iowa and New Hampshire. With the Iowa caucus just six weeks away, guests explain how each candidate is courting voters, and how the campaign is playing out.

On his upcoming trip to Mount Everest, mountaineer Conrad Anker will team up with geologist Dave Lageson to remeasure the peak's exact altitude--a stat scientists still dispute. Physiologist Bryan Taylor will also be in Nepal to monitor how Anker's blood, brain and muscles respond to the thin Himalayan air.

Watch as the U.S. Capitol Police chief testifies on reforms since Jan. 6 security failures.

Watch as members of Congress participate in prayer vigil remembering Jan. 6 insurrection.

Watch as Biden speaks about the continued support for Ukraine.

President Barack Obama went on the offensive against Republican candidate Mitt Romney in the second of three presidential debates. Political Junkie Ken Rudin talks about the face-off's memorable moments, and NPR's Andy Carvin shares which quips and quotes lit up the Internet.

Have you ever wanted to see the view from the top of Mt. Kilimanjaro in Tanzania? Google is making that possible — sending employees up the world's highest peaks with digital cameras, tripods and fisheye lenses to take photos that can be stitched together for a 360 degree view.

In the era of body cameras and cellphones, the act of seeing police do their job is radically altering the public-police relationship, and changing civilian and police behavior and perceptions alike.

Without scrutiny, insurers and data brokers are predicting your health costs based on public data about things like race, marital status, your TV consumption and even if you buy plus-size clothing.

When Purdue professor Daniel Aldrich and his family evacuated New Orleans before Hurricane Katrina destroyed their home, they took only the essentials. Although they applied for federal aid, Aldrich says it was his his social networks that came through for his family when they needed help most.