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Video: Nanoengineered electron guns

In this video we see an electron gun made of many thousands of vertically aligned carbon nanotubes, each more than 1,000 times smaller than the width of a human hair. Dr Matt Cole, from the University of Cambridge, explains ...

Jun 20, 2014 3.8 / 5 (4) 0

The world's most polluted cities

Paris has leapt into the headlines over an alert for dangerous atmospheric particles, yet it does not ordinarily count among the world's most polluted cities. ...

Mar 17, 2014 4.5 / 5 (6) 0