Ever year, the winter solstice comes on December 21 in the Northern Hemisphere. Not only is it the first day of winter, it's a turning point, as the days will then get longer.

Sigrid talks about two important US holidays, Memorial Day and Labor Day. They are quite different in what they commemorate, but they're combined here because many Americans see them as bookends to the summer season.

What do people traditionally do on Memorial Day and Labor Day? Let's find out.

Catch this interview with "the world's first and only "Little House on the Prairie" tribute band." The Half Pints are a heavy metal band with the main goal of "takin' the prairie to the people" by writing songs about their heroes from the popular tv series and performing dressed as the main character Laura Ingalls.

Part 2 of the interview with “the world’s first and only" “Little House on the Prairie” tribute band.” The Half Pints are a heavy metal band with the main goal of “takin’ the prairie to the people” by writing songs about their heroes from the popular tv series and performing dressed as the main character Laura Ingalls.

Part 3 of the interview with “the world’s first and only “Little House on the Prairie” tribute band.” The Half Pints are a heavy metal band with the main goal of “takin’ the prairie to the people” by writing songs about their heroes from the popular tv series and performing dressed as the main character Laura Ingalls.

Part 4 of the interview with “the world’s first and only “Little House on the Prairie” tribute band.” The Half Pints are a heavy metal band with the main goal of “takin’ the prairie to the people” by writing songs about their heroes from the popular tv series and performing dressed as the main character Laura Ingalls.

Part 5 of the interview with “the world’s first and only “Little House on the Prairie” tribute band.” The Half Pints are a heavy metal band with the main goal of “takin’ the prairie to the people” by writing songs about their heroes from the popular tv series and performing dressed as the main character Laura Ingalls.

Part 6 of the interview with “the world’s first and only “Little House on the Prairie” tribute band.” The Half Pints are a heavy metal band with the main goal of “takin’ the prairie to the people” by writing songs about their heroes from the popular tv series and performing dressed as the main character Laura Ingalls.

Come aboard Greenpeace's ship the Arctic Sunrise. Meet Wendy, the ship's cook, as she describes her work and the ship's mission of helping protect our planet's oceans.

The Ocean Cleanup is a Netherlands-based, non-government environmental engineering organization that develops technology to extract plastic pollution from the oceans. They have developed a "passive" cleanup system that takes advantage of the natural oceanic forces of wind, water, and currents.

Coal mining companies and their billionaire owners have titanic plans for Australia. But what disaster course are we on? Take a look to find out what they'd prefer you not to know. Take Action!

Get to know the tiny Australian town of Speed and their mission to help reduce speeding on the roads.

The conflict in the Sudanese province of Darfur has displaced more than two million people and cost nearly 400,000 lives. To raise international awareness, George Clooney and his father, Nick Clooney, visit the region and report their findings in this videos.

In this second part of George Clooney’s video diary from Sudan and Chad, he interviews Jillian, a woman who helped to start a refugee camp in Chad.