My first published writings were trying to take scientific concepts and make them clear for a general audience.

Kids need to encounter kids like themselves - kids who can sometimes be crabby and fresh and rebellious, kids who talk back and disobey, tell fibs and get into trouble, and are nonetheless still likable and redeemable.

Strength is the capacity to break a chocolate bar into four pieces with your bare hands - and then eat just one of the pieces.

Most of the characters I have in my children's books are grouchy or annoyed about something or are calling each other unfriendly names. Like my own kids, they're not honeys and sweetie pies and little angels. They're kids. Sloppy, dirty, stinky.

I think there's a lot of people who right now are worried that people are going down frivolous paths, like inventing new social networks or new games, instead of inventing the cures for cancer or fundamental technologies that will change the world.

We've also seen another future we could choose. First of all, we'd have the right to choose. It's an America in which no one can charge us more than men for the exact same health insurance; in which no one can deny us affordable access to the cancer screenings that could save our lives; in which we decide when to start our families.

Challenges of historic import threaten America's future. Action on the deficit, economy, energy, health care and much more is imperative, yet our legislative institutions fail to act. Congress must be reformed.

The power of community to create health is far greater than any physician, clinic or hospital.