Tag Archives: pollution

History, Imaging, Science, Space, Technology, Travel

Spotting ancient walls at 17,000 MPH

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Great Wall of China
Photo by Tianxiaozhang.

“You know, you can see it for miles – goes on for miles, over the hills and everything. But, so does the M6. Do you know what I mean? You can see that for miles. And you go, ‘Great. And that does a job. You can drive on that.’” Thus did an unimpressed Karl Pilkington of An Idiot Abroad describe the Great Wall of China, allegedly the only manmade object visible from space.

Which raises and interesting question: Why can’t you see the British M6 motorway from space? Or can you? For that matter, can you actually see the Great Wall?

Great Wall of China: Only Manmade Object Visible from Space?

Chemistry, Computing, Consumer, Electromagnetism, Engineering, Gadgets, Green, Health, Materials, Medicine, Physics, Science, Technology, Water Issues

Putting the green in nanomachines

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Carbon nanotubes
Carbon nanotubes. Image courtesy Wikimedia Commons.

We tend to think of nanotechnology as the stuff of the future, but it’s already here, in hundreds of consumer products and industrial applications. As progress in this minuscule world has accelerated, concern for the environment and for public health has led to a call for green nanotechnology—approaches that accentuate the positive and eliminate the negative. In this article, we’ll take a tour of how these many approaches are playing out.

How is green nanotechnology being used?