In science the important thing is to modify and change one's ideas as science advances.

The notion that Congress can change the meaning given a constitutional provision by the Court is subversive of the function of judicial review and it is not the less so because the Court promises to allow it only when the Constitution is moved to the left.

What is amazing for a woman of my age is that I change as the world is changing-and changing very, very fast. I don't think my mother had that opportunity to change.

We're living in an era of unprecedented change, and I want to be a part of documenting it.

Climate change was a point of division between Obama and Republican rival Mitt Romney. The president declared climate change a global threat, acknowledged that the actions of humanity were deepening the crisis, and pledged to do something about it if elected.

Close elections tend to break toward the challenger because undecided voters - having held out so long against the incumbent - are by nature looking for change.

Obama won the presidency on the strength of his message and the skills of the messenger. Now the talk of hope and change feels out of tune when so many Americans are out of work, over-mortgaged, and worried that life will be even tougher for their children.

We, the people. Manifest Destiny. Conceived in liberty. Fear itself. Ask not. Morning in America. United we stand. Yes, we can. In times of great change and tumult, presidents seek to inspire beleaguered Americans by reminding them of their national identity.

Instead of focusing on that circumstances that you cannot change - focus strongly and powerfully on the circumstances that you can.

I think the way to change it is to handle issues individually when it's essential to do so.