Tractor beams are suddenly a lot more plausible
 

Tractor beams now have a better shot at crossing from science fiction trope to reality, thanks to scientists at The Australian National University (ANU). They managed to push and pull a 0.2mm sized particle nearly 20cm using a "hollow" laser beam....

http://www.engadget.com/2014/10/20/h...=rss_truncated