Pangea Day Call for Entries

Pangea Day taps the power of film to strengthen tolerance and compassion while uniting millions of people to build a better future. Click on the link below the image above to see one of the films featured on the Pangea Day web site.

In a world where people are often divided by borders, difference, and conflict, it’s easy to lose sight of what we all have in common. Pangea Day seeks to overcome that – to help people see themselves in others – through the power of film.

On May 10, 2008 – Pangea Day – sites in Cairo, Dharamsala, Kigali, London, New York City, Ramallah, Rio de Janeiro, and Tel Aviv will be videoconferenced live to produce a 4-hour program of powerful films, visionary speakers, and uplifting music.

The program will be broadcast live to the world through the Internet, television, digital cinemas, and mobile phones.

Of course, movies alone can’t change the world. But the people who watch them can. So following May 10, 2008, Pangea Day organizers will facilitate community-building activities around the world by connecting inspired viewers with numerous organizations which are already doing groundbreaking work.

Please use the above link to download an entry form and visit the Pangea Day website for more information.

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Story from the New Zealand Herald

CHICAGO - US scientists have developed a microfibre fabric that generates its own electricity, making enough current to recharge a cell phone or ensure that a small MP3 music player never runs out of power.

If made into a shirt, the fabric could harness power from its wearer simply walking around or even from a slight breeze, they reported in the journal Nature.

“The fibre-based nanogenerator would be a simple and economical way to harvest energy from the physical movement,” Zhong Lin Wang of the Georgia Institute of Technology, who led the study, said in a statement.

The nanogenerator takes advantage of the semiconductive properties of zinc oxide nanowires - tiny wires 1,000 times smaller than the width of a human hair - embedded into the fabric. The wires are formed into pairs of microscopic brush-like structures, shaped like a baby-bottle brush.

One of the fibres in each pair is coated with gold and serves as an electrode. As the bristles brush together through a person’s body movement, the wires convert the mechanical motion into electricity.

“When a nanowire bends it has an electric effect,” Wang said in a telephone interview. “What the fabric does is it translates the mechanical movement of your body into electricity.”

His team made the nanogenerator by first coating fibres with a polymer, and then a layer of zinc oxide. They dunked this into a warm bath of reactive solution for 12 hours. This encouraged the wires to multiply, coating the fibers.

“They automatically grow on the surface of the fibre,” Wang said. “In principal, you could use any fibre that is conductive.”

They added another layer of polymer to prevent the zinc oxide from being scrubbed off. And they added an ultra-thin layer of gold to some fibres, which works as a conductor.

To ensure all that friction was not just generating static electricity, the researchers conducted several tests. The fibres produced current only when both the gold and the zinc oxide bristles brushed together.

So far, Wang said the researchers had demonstrated the principle and developed a small prototype.

“Our estimates show we can have up to 80 milliwatts per square meter of this fabric. This is enough to power a little iPod or charge a cell phone battery,” he said.

“What we’ve done is demonstrate the principle and the fundamental mechanism.”

Wang said the material could be used by hikers and soldiers in the field and also to power tiny sensors used in biomedicine or environmental monitoring.

One major hurdle remains: zinc oxide degrades when wet. Wang’s team is working on a process that would coat the fibres to protect the fabric in the laundry.

- REUTERS

The Bamboo Bike Project is a colaboration between Scientists and Engineers at The Earth Institute at Columbia University , and a bicycle builder at Calfee Design. The project aims to examine the feasibility of implementing cargo bikes made of bamboo as a sustainable form of transportation in Africa. The ultimate goals of the project are:

1.To build a better bike for poor Africans in rural areas.
2.To stimulate a bicycle building industry in Africa to satisfy local needs.