4 key questions about North Korea's bomb that still need answers

An initial analysis show the reported activity in North Korea "is not consistent" with a successful hydrogen bomb test as North Korea has claimed, White House Press Secretary Josh Earnest said on Wednesday

See also: What can we do to stop North Korea?

Others had also expressed skepticism following the hydrogen claims from Pyongyang, though it will likely be days — if not weeks — before further testing and information will be available to determine the nature of the explosion

Meanwhile, there are several other unanswered questions.

If it wasn't an h-bomb, then what was it?

The size of the explosion has led some experts to suggest that North Korea used tritium, a radioactive form of hydrogen, to beef up an explosion caused by a more traditional nuclear device Read more...

More about North Korea, Us World, Hydrogen Bomb, and Tritium