An investigation into the fight over the future of plastics, the crisis of water pollution and whether the plastic industry used recycling to sell more plastic.

How the National Rifle Association (NRA) aligned with President Donald Trump but faces challenges from all sides as the 2020 presidential election looms.

"American Experience" combines dramatic re-enactments with commentary by historians and authors to present an absorbing look at the personalities, events and resources that have had a profound impact on the shaping of America's past and present. Many of the program's documentaries have received major honors in the broadcasting community, including Emmy, Peabodys and duPont-Columbia University awards.

This award-winning series presents compelling untold stories and covers a wide array of provocative subjects. "Explorer" aired for 25 years -- the longest-running documentary series in cable TV history -- before being relaunched in 2015 after a five-year hiatus. Each monthly episode of the new "Explorer" takes a similar deep dive inside a story from the pages of a recent National Geographic magazine issue, taking viewers not only to the most remote corners of the globe but also to the furthest reaches of the mind and deepest crevices of history -- on urgent missions of discovery.

Consistently stunning documentaries transport viewers to far-flung locations ranging from the torrid African plains to the chilly splendors of icy Antarctica. The show's primary focus is on animals and ecosystems around the world. A comic book based on the show, meant to be used an as educational tool for kids, was briefly distributed to museums and schools at no cost in the mid-2000s.

This long-running, award-winning documentary series focuses on science, its many applications, speculation, history and researchers. Inspired by the BBC documentary program "Horizons, " the U.S. series frequently features interviews with scientists directly involved in the topic at hand, and sometimes even boasts footage of a particular discovery.