Tractor beams are suddenly a lot more plausible

http://www.engadget.com/2014/10/20/hollow-laser-tractor-beam/?ncid=rss_truncated
The tractor beams again :)

http://dilulog.blogspot.gr/2011/11/nasa-developing-tractor-beams-no-plans.html

http://dilulog.blogspot.gr/2011/03/tractor-beam-tech-could-eventually-push.html