Legend of the Nazca Lines

A team tests the theory that sharks can smell human blood from a mile away.

Mark Rober's experiment continues as the team donates their own blood.

Internet stars test out some shark-related concepts in pop culture.

These Shark Week experts have experienced a shark bite up close.

Shark Week experts get up close and personal with massive sharks.

These are some of the closest calls ever in the history of Shark Week.

Philippe and Ashlan Cousteau explore Bikini Atoll's thriving marine life.

Luke Tipple and his team unravel the mystery of the the sawfish.

Influenza delves into the history and impact of this constantly evolving virus, which is often tragically underestimated as merely a cousin to the common cold. The episode explores the ongoing threat it poses & the complex science behind it.

Smallpox is one of the deadliest killers on the planet, and though it has been eradicated, it remains a major bioterror threat.

Ebola is one of the world's most lethal viruses, and a perfect storm in 2014 caused the deadliest breakout in history.

Discover how aluminum foil, snowboards, contact lenses and bread are made.

Discover how compact discs, mozzarella cheese and pantyhose are made.

Discover how toothpicks, acrylic bathtubs, helicopters and beer are made.

Discover how hearing aids, 3D puzzles, rubber mats and toilets are made.

Discover how copy paper, jeans, computers and plate glass are made.