Ask Smithsonian: Why Does My Nose Run When It’s Cold Outside?

Greg Spriggs and Jim Moye are on a mission: to declassify all valuable film footage that exists of every U.S. nuclear test ever conducted.

Bringing Classified Nuclear Test Footage to the Public (1:47)

A flock of Andean condors have spotted a carcass in the Southern Cordillera region of Patagonia. It's a rare feeding opportunity in this barren land - and there will be a spirited competition for scraps.

These Condors Will Fight to Get a Seat at the Dinner Table (2:02)

The name sounds innocuous, maybe even charming. But it’s also known by another name—the ant lion—and it’s every bit as predatory and remorseless as that name sounds.

Doodlebug Is a Misleading Name for an Accomplished Assassin (3:04)

When birds need sleep, they do it on the fly--quite literally. They're able to enter a special kind of half-sleep state that lets them rest midair, which is especially important if you're a migratory bird, like the Alpine swift, clocking thousands of miles at a time. Glide into the astounding world of avian sleep.

The Secret World of Animal Sleep: Asleep on the Wing (3:01)

No bird is more skilled at in-flight feeding than a hummingbird, thanks to their ability to hover in the air. But if it's rainy, these fantastic flyers have to be extremely careful not to get hurt.

Why Hummingbirds Don't Like Flying in Rainy Conditions (2:17)

A military-grade thermal camera lifts the lid on the night time excursions of hippos on dry land. Those consist of grazing on a staggering amount of grass, while keeping a watchful eye out for roaming lions.

The Secret and Busy Night Life of Adult Hippos (3:27)

A shy orangutan makes great strides by confidently securing her share of breakfast. But she’s not above sharing her bounty of turnips with another orangutan, whom she’s befriended.

A Shy Orangutan Shares Her Breakfast With a Friend (2:11)

Separated from the mainland, the babirusa pigs of Sulawesi have evolved in total isolation. This has resulted in some pretty dramatic differences from regular pigs—especially in their appearance

Meet the Strangest Pigs in the World (3:14)

A herd of migrating elephants are acquiring necessary minerals like calcium and potassium from a burnt wood clearing. It’s also an impromptu reunion spot for all traveling elephant herds.

This Salt Lick Doubles as a Reunion Spot for Elephants (2:23)