There is a lot of talk about how 3D printing could revolutionize the way that we make stuff. But what is 3D printing and how does 3D printing allow us to make almost anything from nothing? Professor Tim Minshall, Head of the Institute for Manufacturing at the University of Cambridge, explains it in this video, which is targeted at school-age students.

The University of Cambridge is one of England's greatest universities. There's no main campus – instead, the university's many colleges are scattered throughout the charming town center. Many colleges welcome the public to browse around.

Have you ever been unsure as to how elections work in the US on a federal and state level? This video explains it all.

Watch this video for "Dance The Night Away," the first top 20 hit of the American rock group Van Halen.

At the University of Sydney, physicist Derek Muller explores the possibility of an anti-gravity wheel through a series of field tests.

Greentraveller's Richard Hammond shows you some of the loveliest and greenest spots in London, and gives some tips for navigating through the city.

We meet a young woman, Caralie, on the street. She takes us to her apartment building. She checks her mail-box. She invites us inside and up the stairs to her third-floor apartment.

Caralie takes us into her kitchen. Here she talks about fruits, vegetables and preparing soup. She also shows us some important appliances in her kitchen.

Welshy Arms, a blues rock band from Cleveland, Ohio, have had their song "Legendary" featured in movies, on wrestling shows, TV shows, commercials, and even a video game soundtrack. But it started out on their album No Place Is Home.

White Lies are from England and make wonderful indie rock music. Check out this tune by them entitled “Farewell to the Fairground.”

The Graham Norton Show: Among the guests on Graham's sofa are Hollywood star Will Smith and musician Gary Barlow, who together with the audience perform the rap from The Fresh Prince of Bel-Air, the TV show that catapulted Will to stardom.

UK rock band Wizzard, with their charismatic big-bearded frontman and founder Roy Wood, scored their biggest hit ever with this glam rock Christmas classic from 1973. It is still played in the UK every Christmas season.

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Today, planet Earth is in a new era, the Anthroprocene. Humankind has harnessed and exploited Earth’s resources, changing its surface, devastating populations of wild animals, cutting down trillions of trees and leaving very little of what was “wild.” The enormous loss of biodiversity is not sustainable. How can we create a future in which both people and nature can thrive?

Can planet Earth survive? Can we survive as a species? Changes in population growth could be a key factor to allowing us to prosper and live in harmony with nature once again.