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For five million years the Colorado has carved some of the most majestic landscapes on the planet. It has also become the lifeline of a vast portion of North America, providing the water that sustains nearly forty million people, a half dozen major cities, and an immense agricultural empire. Because of these demands, the river is so overused and overcompromised that it no longer flows to the sea or nourishes its delta.

Learn how the longest reigning monarch in British history was shaped by World War II. Princess Elizabeth’s experiences during the war mirrored those of the public and helped shape her into the Queen she is today.

Examine the presidency of George H.W. Bush and his foreign policy team’s expertise as they navigated international crises like the fall of the Berlin Wall, reunification of Germany, collapse of Russia, the Panama invasion and the invasion of Kuwait.

On July 30, NASA will be sending the rover named Perseverance to Mars to look for signs of ancient life and to bring back rock and soil samples to Earth. Before the launch, tune in for special episodes of “Catalyst” that focuses on the mission and other space exploration.

Explore some iconic historical moments while debunking long-held myths and shining new light on past events. Advances in investigative techniques, forensic science and historical scholarship offer new evidence on forgotten mysteries.

Join Emily Graslie for a summer road trip through America’s dinosaur country on a search for mysterious creatures and bizarre ecosystems that have shaped Earth.

“Carbon Cowboys” is a documentary series in 10 paddocks, directed by Peter Byck. It tells the stories of cattle ranchers who work with nature instead of fighting her, creating healthy soils, ecosystems, animals and food in the process. Can these farmers help solve the climate crisis as well?

Explore what happened when police raided the Stonewall Inn, a gay bar in New York City on June 28, 1969. The streets erupted into violent protests that lasted for six days and marked a major turning point in the modern gay civil rights movement.

This compelling story of a fight for LGBTQ rights and justice is also a chilling reminder of how easy it can be, during a time of fear and uncertainty, to trample the rights of an entire class of people in the name of patriotism and national security.

Follow Dyllón Burnside on a journey across the American South to meet diverse members of the LGBTQ+ community. From a lesbian rodeo champ in Texas to an African American mayor ally in Alabama, he discovers how LGBTQ+ Americans are finding ways to live authentically and with pride in the modern South.