Scientists have built a tractor beam that can repel and attract objects, using a hollow laser beam that is bright around the edges and dark in its centre.
Scientists have developed a real-life "tractor beam", which uses light to attract objects, and could have medical applications by targeting and attracting individual cells.
Day in Pics: 25th December
Showbiz World - December 25, 2014
Sunny Leone with Mastizaade