The cool thing is that nothing isn't nothing any more. Science is changing our understanding of nothing to the point that what we considered nothing prior actually has a lot of something. In quantum fluctuation we can see particles popping in and out of existence in fields of "nothing" all the time.
Your assertion is incorrect. It may be the way popular science defines quantum fluctuations, but it has now been proven incoreect with the work of Bernard Haisch and his associate Rueda. Look for their 2005 paper in Physics.