Unknowns lead to things being known, so whatever is known is known. Even if they know that something is unknown, the fact that it is unknown is known.
Me lol And if you mean not me, then probably Admiral William
Nuclear energy is made by the release of energy when splitting atoms (little explosions), so yes, there is always minor explosions with nuclear energy, no matter what you are using as the source of fuel.
There is no scientific evidence supporting the wives tale that popping your joints is bad for you. In some cases, if you don't pop them the air in the joints can build up and become painful. However, with popping your joints there is always the chance of overextending and injuring yourself. Basically, it's a 50/50.
There are many God's. There is Ra, Jehovah, Allah, Zues, and Thor to name a few. If there were no God or Gods, then there would be no religion. As far as if they exist, that's up in the air at the moment. The universe does show some signs of an intelligent creator, but not conclusively. Also, impossible to answer questions will be ignored lol You know this.