See what Fred Armisen, Christopher Walken and Carly Simon each learn about a grandparent.
Visit Mount Everest's Khumbu Icefall, the Grand Canyon, and the slopes of Mount Kilimanjaro.
Discover new archeological evidence that suggests Troy and the Trojan War may be more than myth.
Investigate how and why life-sized terracotta statues were made for Emperor Qin Shi Huang of China.
Follow an investigation of the hidden dangers of vitamins and supplements, a multi-billion-dollar industry with limited FDA oversight.
Explore a family of Yunnan snub-nosed monkeys, both childlike and wise beyond their years, living in the world's highest forests.
Take a detailed look at owls and see how they’re influencing 21st-century technology and design.
Travel around the world and back in time to investigate how minerals are vital to life.
Follow the epic operation to secure, raise and salvage the Costa Concordia cruise ship.
Examine the friendship between a journalist and a sloth, and see people trying to protect sloths.