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A security guard at the airport notices something going wrong on the tarmac, and takes it upon herself to fix it. 

Graeme told us in the interview that he’d often wondered if you could calculate how fast the brick would have been going as it whizzed past his head. Here's the problem. Do you know the solution? 

Once a wall is built, it becomes a fact on the landscape that can totally change the logic of the world around it. In the episode “The Walls,” we have stories about people at walls all over the globe. Fly around to visit the walls in each story. 

In 1967, the first black students integrated the South’s elite prep schools. One of the main reasons they were there? To benefit the white kids.