But he says understanding these differences can help discover how some complex processes on our own planet really work.

VOA: special.2009.12.30

"Our two countries continue to disagree on certain issues, such as Georgia,and we addressed those differences candidly."

VOA: standard.2010.06.24

"How can we empower our president and the Congress and the government to start to move the country forward, notwithstanding the differences we have,"

VOA: standard.2010.03.18