I have mentioned the EmDrive several times in articles on space propulsion. The EmDrive is in the news again because a peer-reviewed paper on the drive has been submitted by NASA’s Eagleworks.
That does not mean that the EmDrive has been proven to actually work, but it does mean that it is getting some serious scientific attention. The video above is a good overview of the EmDrive by physicist Scott Manley. He talks about how the EmDrive is supposed to work, as well as the physics that says that it shouldn’t. (Manley has his own YouTube channel).
If you have interest in the EmDrive, it would be worth your time (about 16 minutes) to watch this video.