In this tutorial you will learn how use the ARewO Add-on and Metaballs to create a double-strand of a DNA molecule.
Many thanks Gottfried for posting this, and to Frederik for writing the ARewO addon! 
I got an email about the addon via email from YouTube, and now see your threads
on it.
I will post an animation and hope others will also.
This looks like a very fun and useful addon. 