W54: How powerful is the smallest nuclear bomb that can be put in a backpack?

Do you know how much the smallest nuclear bomb in the world weighs? It is said that it can be put in a backpack, so how powerful is it?   In 1945, the United States dropped the first military atomic bomb “Little Boy” on Hiroshima, Japan. It has to be said that the name is… Continue reading W54: How powerful is the smallest nuclear bomb that can be put in a backpack?