Winter Olympics: Is window for US-N Korea peace closing?

They were called the "peace Olympics", but let me tell you, there was no peace in Pyeongchang.

There was a constant cacophony from the crowds inside and outside the stadiums. An atmosphere of excitement and wonder at what medals could be won.

In contrast, the huge diplomatic efforts surrounding the Winter Games are discussed in uncertain whispers.

Did you see North Korean President Kim Jong-un's sister? Do you think the South Korean president will go to Pyongyang? What could happen next?