From the video description:

In which the dinosaurs go extinct and 66 million years later people get angry about it.

What killed the dinosaurs? Maybe you think you know.

Many others thought they knew. They saw hundreds of years of scientific progress, shifting paradigms, and explosive arguments behind them, and decided they were at the end. The K-Pg extinction was settled. Then it exploded again. And again. And it kept exploding way more than any layperson today really appreciates, revealing more about science and its communication than you ever imagined.

This is the story of the mass extinction debates.