My understanding is that, while cold fusion might require some previously unknown interaction, Em Drive's issues are a bit more fundamental. If the Em Drive wo

My understanding is that, while cold fusion might require some previously unknown interaction, Em Drive's issues are a bit more fundamental. If the Em Drive works, it invalidates a lot of mathmatical equalities that are derived from the fact that electro-magnetism works through fields. So you're basically invalidating the fundamental nature of electro-magnetism, not "just" conservation of energy