There isn't a "twelve Symphony of Science video" in the traditional sense. The Symphony of Science series is a collection of videos by John Boswell that remixes speeches and lectures by scientists and thinkers into catchy, music-driven tracks.

It's likely you're thinking of a specific video within the series, or you're thinking of the number of videos within the entire series.

To help me understand what you're looking for, could you tell me:

* Do you have a title or a specific topic in mind?

* Are you looking for a particular video within the series?

* Are you looking for the total number of Symphony of Science videos?

Once I have more information, I can help you find the video you're looking for.