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1:54
Author Dave Cullen discusses gun violence.
2:54
The father of a Columbine victim to Monday's shooting alongside author Dave Cullen.
2:02
Mayor Keisha Lance Bottoms of Atlanta discusses her state's Senate election results.
2:58
John Hume Jr. and Martin Luther King III reflect on their fathers' legacies.
2:53
Elizabeth Neumann discusses bipartisan immigration reform.
18:18
Pro Basketball Player Jeremy Lin speaks out against anti-Asian racism and violence.
17:35
Dr. Vivek Murthy explains what's gone wrong with vaccine distribution.
17:47
Neil deGrasse Tyson discusses his new book "Cosmic Queries."