Neil deGrasse Tyson on what space militarization means07:13
Author and astrophysicist Neil deGrasse Tyson discusses his new book 'Accessory to War: The Unspoken Alliance Between Astrophysics and the Military.'
Party leadership remains locked as shutdown drags on16:20
Inside Davos forum, minus U.S. leadership14:06
New book looks at Kennedy, Carter and 198005:18
Dems can't give into Trump's 'feet stomping': Rep. Dean10:05
Trump approval falls to 36 percent in new poll05:02
Pete Buttigieg launches exploratory committee05:22