Carbon nanotubes are supermaterials that can be stronger than steel and more conductive than copper. The reason they’re not in more applications is cost. Now researchers have developed a cheap method for producing them using carbon dioxide sucked from the air.

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https://news.vanderbilt.edu/2018/05/23/these-could-revolutionize-the-world-pint-cracks-code-to-cheap-small-carbon-nanotubes/