According to this article a 19-years-old girl from Egypt patented a discovery which will help build spaceships that can travel with little or no fuel:
“Mustafa believes it is possible to use vacuum energy fields to create propulsion and build spacecraft propulsion systems that need little or no fuel to travel in space. According to Fast Company, Mustafa is betting on exploiting quantum effects involved in dynamic Casimir effect and the Casimiri-Polder force. She uses two silicon metallic plates in a vacuum, “like capacitors placed a few micrometers apart.” The plates interact with the virtual photons in the quantum field and generate a net force that is either an attraction or a repulsion depending on their arrangement.”
Read more: http://digitaljournal.com/article/325785
This is a nice synchronicity since I was looking into that Casimir effect just two days ago after reading an article about so-called free energy devices.