Monday's explosion dashed hopes that the secretive nation is simply building its weapons program as a bargaining chip.
Monday's explosion – the latest in a series of hard-line moves by Pyongyang – may have been 20 times more powerful than its last test in 2006.
As Congress worries about the dangerous prisoners, a Chinese Uighur asks: Why not release those deemed innocent?
Backers say the agreement with the United Arab Emirates is a model for other countries in the region. But critics worry about the UAE's ties with Iran.
Retired General Charles Bolden gets high praise from those who've flown with him.
The compromise measure would mandate reductions in greenhouse-gas emissions and require greater use of renewable energy. The Senate could be a major stumbling block.