In 2011, researchers from China and Hong Kong showed how it might be done with laser beams of a specific shape - and the US space agency Nasa has even funded a study to examine how the technique might help with manipulating samples in space.

BBC: Star Trek style 'tractor beam' created by scientists

Craig Fugate, the Federal Emergency Management Agency administrator, told CNN the agency is in "good shape" to support the recovery in Oklahoma and in other disaster zones, such as rebuilding after Hurricane Sandy in New Jersey and New York.

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The shell of Viridor's plant is already taking shape with planning permission given by Cardiff council in 2010, and the Environment Agency awarding an operational permit after consultation.

BBC: Artist's impression of a Viridor plant in Cardiff