Polaroid Portraits: Capturing President Obama’s Second Inauguration

The Karez is a modern-day engineering marvel and a prime example of people working with, not against, the forces of nature to deliver their needs—in this case, water.

This Ingenious System Brings Water to the Chinese Desert (3:25)

Gasp! The answer will amaze you.

Ask Smithsonian: How Long Can a Person Hold Their Breath? (1:32)

A hammerhead shark locates a stingray hiding beneath the ocean floor. Unnerved, the stingray makes a dash for freedom but is it too late?

Hammerhead vs. Stingray (2:25)

Whale milk is some of the richest milk available to any mammal. A baby whale will drink 150 gallons of it a day to sustain its dramatic growth.

Baby Humpbacks Need 150 Gallons of Whale Milk a Day (2:51)