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    Jon Stewart fights to help veterans exposed to burn pits (Part 1)

    04:10
  • Jon Stewart fights to help veterans exposed to burn pits (Part 2)

    02:53
  • Inside the effort to feed Florida's manatees (Part 1)

    02:58
  • Inside the effort to feed Florida's manatees (Part 2)

    01:02
  • 80 years after Pearl Harbor, survivors reflect on the day that changed history (Part 1)

    06:28
  • 80 years after Pearl Harbor, survivors reflect on the day that changed history (Part 2)

    06:29
  • Musicians spreading holiday cheer in hospitals across U.S. (Part 1)

    01:43
  • Musicians spreading holiday cheer in hospitals across U.S. (Part 2)

    02:17
  • Blood test detects over 50 types of cancer (Part 1)

    02:31
  • Blood test detects over 50 types of cancer (Part 2)

    01:28
  • How the elite U.S. Forest Service hotshots battle wildfires (Part 1)

    02:05
  • How the elite U.S. Forest Service hotshots battle wildfires (Part 2)

    02:08
  • Climate change in Guatemala: Between starvation and migration (Part 1)

    06:51
  • Climate change in Guatemala: Between starvation and migration (Part 2)

    05:11
  • A look at St. Louis' iconic Gateway Arch (Part 1)

    02:01
  • A look at St. Louis' iconic Gateway Arch (Part 2)

    01:58
  • Extended interview: Rita Moreno and Ariana DeBose on ‘West Side Story’ remake (Part 1)

    03:03
  • Extended interview: Rita Moreno and Ariana DeBose on ‘West Side Story’ remake (Part 2)

    03:18
  • Black playwrights take center stage on Broadway (Part 1)

    03:46
  • Black playwrights take center stage on Broadway (Part 2)

    02:24

They were at school blocks from ground zero on 9/11. Students reflect 20 years later (Part 1)

05:39

Hannah Moch and Ian Slade Tullis were fourth graders in Pat Carney’s class at PS 234, just blocks from ground zero, on September 11, 2001. NBC News spoke with the group one year later and for the 10th anniversary. Now as the nation marks 20 years since the terrorist attacks, they share their reflections with Rehema Ellis.