In the early 20th century, America has a dozen national parks, but they are a haphazard patchwork of special places under the supervision of different federal agencies. The conservation movement, after failing to stop the Hetch Hetchy dam, pushes the government to establish one unified agency to oversee all the parks, leading to the establishment of the National Park Service in 1916. Its first director, Stephen Mather, a wealthy businessman and passionate...

NASA launches its most ambitious hunt for traces of life on Mars, landing a car-sized rover in a rocky, ancient river delta. The rover will stow samples for possible return to Earth and test technology that may pave the way for human travel to Mars.

Caillou gets laryngitis and loses his voice so he spends the day playing charades in order to communicate. Caillou and his friend Leo spend the day looking for a a lost toy airplane and find everything but. When he goes to visit his grandpa, Caillou is given a very special place to hide. Real kids play hide-and-seek. Rexie uses magic to help DeeDee find her "precious thing."

It's a race to the toy store after Arthur realizes he may have given away his chance at 2 million dollars! Unless Muffy, Buster, and Binky can comprise, they'll be stuck with a boring windmill at the new 18th hole at the mini golf course.

For 45 centuries, the Great Sphinx has cast its enigmatic gaze over Egypt's Giza plateau. The biggest and oldest statue in a land of colossal ancient monuments, its scale is staggering. How was it built, and who or what does it represent? NOVA's expert team of archaeologists carries out experiments that reveal the techniques and incredible labor that was invested in the carving of this gigantic sculpture.

Three centuries of engineering have produced telescopes far beyond Galileo's simple spyglass. Perched on mountaintops, orbiting the Earth, and even circling other planets, these telescopes are revealing the solar system in detail Galileo could only dream of. Get up close with today's most powerful telescopes and embark on a stunning journey to the planets and moons now being imaged as never before.

Math, schmath. That's what Sue Ellen thinks… until she runs into a problem her artistic vision can't solve. Sue Ellen can't wait to meet her pen pal in person.

When COVID struck, the Federal Reserve stepped in to try to avert economic crisis. As the country's central bank continues to pump billions of dollars into the financial system daily, who is benefitting and at what cost?

THE WAR, a new seven-part documentary series directed and produced by Ken Burns and Lynn Novick, explores the history and horror of the Second World War from an American perspective by following the fortunes of so-called ordinary men and women who become caught up in one of the greatest cataclysms in human history.Six years in the making, this epic 14-hour film focuses on the stories of citizens from four geographically distributed American towns...

Hard as it is to swallow, cutting-edge theories are suggesting that our universe may not be the only universe. Instead, it may be just one of an infinite number of worlds that make up the multiverse. In this show, Brian Greene takes us on a tour of this brave new theory at the frontier of physics, explaining why scientists believe it's true and showing what some of these alternate realities might be like. Some universes may be almost indistinguishable...