Childhood obesity isn't some simple, discrete issue. There's no one cause we can pinpoint. There's no one program we can fund to make it go away. Rather, it's an issue that touches on every aspect of how we live and how we work.

I think the most moving part of my trip [to Africa] so far was seeing 92-year-old Nelson Mandela, and just thinking about his life. This man has lived through a struggle that few nations have known.

Good relationships feel good. They feel right. They don't hurt.

Barack Obama was a black man that lived on the South Side of Chicago, who had his share of troubles catching cabs.

The only limit to the height of your achievements is the reach of your dreams and your willingness to work hard for them.

Barack didn't pledge riches, only a life that would be interesting. On that promise he delivered.

Investing in girls' education is the very best thing we can do, not just for our daughters and granddaughters, but for their families, their communities, and their countries.