Johannes Gutenberg was a inventor, printer, and publisher
It is 70 kilometers or 43.5 miles long.
The Hydrogen bomb uses fusion, and fusion is more powerful than Fission, which was used in Atomic Bombs. <em>The hydrogen bomb was more destructive than the atomic bomb.</em> Both are nuclear weapons but Hydrogen has more power and that is how it differed from the atomic bomb during the Cold War arms race.
