Maangchi's career was born when her son suggested she start making videos of herself cooking Korean dishes.
President Barack Obama on Monday nominated Chuck Hagel as his next secretary of defense and John Brennan as the next head of the CIA.
Both nominations are likely to be controversial. Hagel, a former senator, has been criticized by fellow Republicans over his positions on Israel and Iran.
Brennan has faced questions about his connection to controversial interrogation tactics used during the Bush administration.
Brennan, who was the CIA’s deputy executive director under President Bush, is now President Obama’s counterterrorism adviser.
Peter O’Dowd follows the route of Abraham Lincoln's funeral train 150 years ago, to look at modern-day race relations and Lincoln's legacy.