And we'll always be an experiment in that way - freedom and assimilation of different ethnic groups all living together in different cultures.

NPR: Scorsese on the Immigrant Experience on Film

But we will always be aware that those judgements - however small or insignificant they may seem in isolation - can together change the character of our country.

BBC: Cameron's data speech in full

There always will be healthy competition between China and the United States in developing and marketing technologies, but we must work closely together to scale up and commercialize the best ideas, regardless of whether it comes from our two nations or other countries in Europe or Asia or North America.

CNN: Coal-burning CEO: U.S., China must fight pollution