While I understand the applications are limitless, the general usefulness of stuff is pretty obvious. For example, energy and fusion was a great answer. That might be one of the most important ones. Obvious other ones would be transportation, defense, communication, computing, pharma, manufacturing, culture, politics...

I'm less interested in how it can be applied to every industry, but since I'm jumping in on a "conversation" I guess what's most relevant is what makes you excited about this. That's definitely not clear to me yet.