(3)A recent New Scientist(1) article examines a new engine developed by Roger Shawyer that generates thrust from electromagnetic radiation in the form of microwaves. The 'emdrive' has no moving parts, and releases no exhaust or noxious emissions. Shawyer believes his engine can be used to propel rockets, and will one day make today's planes, trains and automobiles obsolete. Read more here(2).

1. http://www.newscientisttech.com/article/mg19125681.400
2. http://www.newscientisttech.com/article/mg19125681.400
3. http://www.newscientisttech.com/article/mg19125681.400