A big part of leadership is just being comfortable with the fact that some decisions really are only yours.

The difference between rich and poor is becoming more extreme, and as income inequality widens the wealth gap in major nations, education, health and social mobility are all threatened.

Ethiopia's government is doing a commendable job of working closely with donors and humanitarian organizations to educate parents about child marriage, and to support organizations like the Hamlin Fistula Hospital.

As many as half of Ethiopia's girls become wives before becoming adults. But Ethiopia is also a place where lasting solutions to child marriage are starting to make a difference.

I try to exercise three to four times a week.

Illegal immigrants are beginning to comprise a black market class of workers in our society, jeopardizing the financial health of companies which play by the rules, while themselves vulnerable to the exploitation by those willing to take advantage of their illegal status.

If any country was a mine-shaft canary for the reintroduction of cholera, it was Haiti - and we knew it. And in retrospect, more should have been done to prepare for cholera... which can spread like wildfire in Haiti... This was a big rebuke to all of us working in public health and health care in Haiti.

The Greeks were the first boxers. Pugilism appears to have been one of the earliest distinctions in play and exercise that appeared between the Hellenes and their Asiatic fathers. The unarmed personal encounter was indicative of a sturdier manhood.