SCIENCE

The Length of the Seasons

Star Gazers

The Length of the Seasons

It may not seem like it, but winter is the shortest season of the year in the northern hemisphere.

Snowbound: Animals of Winter

Nature

Snowbound: Animals of Winter

The coldest places on Earth, such as the Arctic Circle or Antarctica, pose a challenge to human visitors. How does the year-round animal population cope? Explore how they adapt to their surroundings or employ clever tactics to survive.

The Nuclear Option

Nova

The Nuclear Option

How will we power the planet without wrecking the climate?

Watch These Frustrated Squirrels Go Nuts!

Deep Look

Watch These Frustrated Squirrels Go Nuts!

Humans aren’t the only creatures that get frustrated. Squirrels do too. One researcher wants to know, could there be an evolutionary benefit to losing your cool?

Secrets of the Sky Tombs

Nova

Secrets of the Sky Tombs

A team of scientists and explorers probe high altitude caves in the Tibetan Himalayas looking for clues as to how humans found their way into this forbidding landscape.

Vibrating Bumblebee Unlocks Flower’s Treasure

Deep Look

Vibrating Bumblebee Unlocks Flower’s Treasure

Most flowering plants are more than willing to spread their pollen around. But some flowers hold out for just the right partner. Bumblebees and other buzz pollinators know just how to handle these stubborn flowers. They vibrate the blooms, shaking them until they give up the nutritious pollen.

Nature: Animal Love Stories

Nature

Nature: Animal Love Stories

Animals dance, sing, flirt, and compete with everything they've got to find and secure a mate. For many, the all-important bonds they share as a couple are what enable the next generation to survive. These are love stories as various and intriguing as the lovers themselves.

The Great Math Mystery

Nova

The Great Math Mystery

Pi is commonly recognized as a number that relates a circle's circumference to its diameter, but it also appears in many other phenomena. Is math invented by humans, or is it the language of the universe? Discover math’s signature in the swirl of a nautilus shell, the whirlpool of a galaxy, and the spiral in the center of a sunflower.

The Moon vs. the Geminids

Star Gazers

The Moon vs. the Geminids

Why are some meteor showers better than others? The answer lies with the phases of the moon.

Orion Rises in the East

Star Gazers

Orion Rises in the East

As the Summer Triangle sets, Orion rises in the night sky.