28 October 2014
A Norwegian invention is reducing by a third the energy that foundries need to manufacture ship propeller blades. Some of the propeller blades being manufactured are so big that if the complete propeller stood on end, it would reach up to the roof of a three-story building.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/qhtYKvWyhlM/141028082504.htm
