This is a good video about dark matter and dark energy. Sean Carroll has a bit of a sarcastic sense of humor that is sometimes a distraction, but on balance I would recommend it. There may be a few parts that are hard to follow, but he's trying to explain graduate-level physics to laypeople, and he does a pretty good job.
I love the course, the professor really knows the subject and does an excellent job of making this subject interesting and very understandable to the non-professional. The only reason I gave it a 4 instead of a 5 was because it did NOT include the book and they did not tell you that it was not included.