Pitting one alien against another may be the way to fight an invasion, especially if the alien is Japanese Knot Weed - we'll find out more in this week's Naked Scientists News Flash! Also, we find out how reading brain activity could mean a new lease of life for paralysed people, why the colour of your childhood TV set may affect your dreams and how a 50 year old experiment has been brought up to date to tell us about the origins of life on Earth.