For the past 50 years, the world has grown used to crazy threats from North Korea that don't lead anywhere.
But with young and untested Kim Jong-un in charge of a nuclear arsenal, no one knows what will happen next.
Kim Jong-un was born on January 8 in 1982 or 1983 or 1984.
His parents were future North Korean dictator Kim Jong-il and his consort, Ko Young-hee.
He had an older brother named Kim Jong-chul and would later have a younger sister named Kim Yo-jong.
While Jong-un's official birth year is 1982, various reports suggest that the year was changed for symbolic reasons, including that it was100 years after the birth of Kim Il-sung and 70 years after the birth of Jong-il.
Jong-un (pictured here with his mother) lived at home as a child.
During this period, North Korea was ruled by "Great Leader" Kim Il-sung.
While Jong-il was the heir apparent, Jong-un's path to command was far less certain.
Then it was off to Switzerland to attend boarding school.
Called "Pak-un" and described as the son of an employee of the North Korean embassy, Jong-un is thought to have attended the English-language "International School" in Gümligen near Bern.
Jong-un is described by former classmates as a quiet student who spent most of his time at home, but he had a sense of humor too.
“He was funny," former classmate Marco Imhof told The Mirror. "Always good for a laugh."
“He had a sense of humour; got on well with everyone, even those pupils who came from countries that were enemies of North Korea,” another former classmate told the German newspaper Welt am Sonntag. “Politics was a taboo subject at school . . . we would argue about football, not politics.”
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