There is a fourth method, discovered by plasma scientists in USA. In a plasma chamber, while creating electricity, live plasma creates certain elements from itself too. They didn't say it directly that they had made gold, but named their company after gold as a hint. They were deeply moved by their discovery of what plasma is. it fills the universum, there's no vacuum, everything is alive, stars are alive and made of plasma, and everything is connected instantly. We're up to huge new discoveries and revelations of what the truth about life really is.