Host Emily Calandrelli speaks to experts who are learning everything they can about asteroids and their potential impact on earth. From the dinosaur killer to the Chelyabinsk meteor of 2013 - we learn about the destructive power of asteroids. Emily takes a trip to the Ames Vertical Gun Range for an experiment that predicts impact size on the moon and the Earth. Emily also travels to Seattle Washington to meet a company that has a plan to profit from...

Cari heads to the ancient city of Jerash, one of the largest and most well preserved sites of Roman architecture in the world. She dances alongside bagpipers in Jerash's famous amphitheatre and is then off to Wadi Mujib, the lowest nature reserve in the world. She spends the day wandering through a water-filled gorge. WOW!

Four Corners explores the world of Facebook and how your data is being mined to drive the huge success of the social media giant. Reporter Peter Greste examines the Facebook business model and shows why your private life is making the company billions.The program investigates how Facebook has the ability to track much of your browsing history, even when you're not logged on, and even if you aren't a member of the social network. It also reveals how...

The story of the American flag is told, from Revolutionary War days to the present. Viewers see many of the flags that have flown over the United States: the Join or Die, the Don't Tread On Me, the Continental Colors, and, of course, the Stars and Stripes, while learning the historical background of each one. Youngsters learn what the flags symbolize, what the various parts mean, and how to maintain and properly display the American flag. A special...

Webmaster pulls some strings for Paula's next mission, which begins at a Chinese puppet theatre. Her mission hits a high note when she stops by a traditional opera school. Paula's mind is spinning as she watches young roller-skating acrobats. After a hearty Chinese dinner, she's off to the Shanghai circus to learn about tumbling and to watch a show-stopping stunt.

Two children are excited to celebrate the Fourth of July but don't know much about what caused the American Revolution. Mr. Beanbody the dog uses an app to take them back in time to Massachusetts in the run up to Revolution. From 1763, right after the French and Indian War, through the formation of the Continental Congress, Colonists gradually move from proud, loyal British subjects to preparation for violent rebellion.

Discusses the role of Philadelphia and the city's patriots before, during and after the American Revolution.

Travel to Colonial America and explore the rise and fall of slavery. This video uncovers the cruel conditions of the enslaved and discusses those who helped them escape through the Underground Railroad. Witness how slavery was ended during the Civil War.

Understand the abolitionist movement against slavery and how it developed into the American Civil War. Focus on the specific people who spoke up. Witness how the Emancipation Proclamation and the 13th amendment freed the slaves and abolished slavery.

Viewers learn how famous African Americans, including Obama, overcame racial barriers to become successful.