A greeting by Michael Reynolds, Earthship Biotecture and THE Garbage Warrior. See more at garbagewarrior.com – and order the DVD.

The birth cycle of kangaroos, affectionately called “roos,” is the subject of this video from National Geographic.

Within a deep and narrow cave in South Africa, paleoanthropologist Lee Berger and his team found fossil remains belonging to the newest member of our human family. The Homo naledi discovery adds another exciting chapter to the human evolution story by introducing an ancestor that was primitive, but shared physical characteristics with modern humans.

Many secrets remain surrounding the creation of Stonehenge. Archaeologists try to unravel the mystery.

Ellis Island, the U.S. gateway to immigration from distant lands, has been reopened to visitors, following significant damage from Hurricane Sandy. A visit there, and to the nearby Statue of Liberty, can be emotional, even for those born in the U.S.

When hit US sitcom That '70s Show finally ended its long and successful run, the actors came together to reminisce and relive the good times and best moments. How did it all get started? Did any of them ever dream that the show would be so popular?

Looking back at the pilot episode from all those years ago, the actors explain why the show made audiences of different ages laugh, and cringe at their own acting skills.

Eric finds that the road to happiness is not without a few bumps as his and Donna's teenage romance becomes an adult relationship.

The cast hadn’t met before filming the show, but there was a good chemistry between them right from the start. When they got together and were having a good time, the viewers knew it, and very soon were also having a good time watching.

Some memorable scenes came when That '70s Show pioneered new camera techniques. They were the first show using “three sixty degree” scenes, bringing each character into sharper focus, often with hilarious results.

The cast recall their favorite moments of a show that didn’t mind pushing the boundaries. A cartoon episode was made, and the “three-sixty” scenes were a huge hit — to the extent that they often weren't even related to the storyline.

The basement film set and its contents have taken a battering over the years of filming. Now that the show is coming to an end, the actors are dividing up the props, keen to take a memento from the studio that has become a home away from home.

The whole cast got to break out of their routine and enjoy roles in the many fantasy sequences that were a feature of the show. Often based on iconic stage and screen performances, some actors were able to live out their personal acting fantasies and play parts they had always dreamed of.

Things on set didn’t always go as planned. Sometimes the young actors got the giggles, and sometimes they even got hurt, but each found their own way of dealing with the unexpected. Luckily, the director of the show was extremely patient with them.

When the unexpected happened, it was sometimes best to stay in character and try to get a bigger laugh. In particular, Ashton Kutcher, who played Kelso on the show, was willing to endure some painful knocks if it made the audience happy.