Marburger says he thinks the relationship between policy makers and scientists is made more difficult by the rapid pace of scientific progress.

NPR: Bush Science Push Fails to Transform Critics

During the last few decades a significant amount of research has been conducted into the relationship between mood and weather, scientists looking for a link between atmospheric condition and personal disposition.

BBC: Does sunshine make us happier?

However, scientists do not fully understand the relationship between air and sea temperature, and the melting of ice.

BBC: Polar expedition to study Antarctica's climate history

Following the 2005 drought, scientists were able to study the impact on trees and work out the relationship between the rainfall loss and the release of carbon.

BBC: Amazon drought 'severe' in 2010, raising warming fears

What scientists are learning, however, is that this relationship between corals and algae is also based on a delicate communication process from the algae to the coral, telling it that the algae belong there, and that everything is fine.

CNN: Report: Coral almost as genetically complex as humans

Scientists aren't sure of the exact relationship between Alzheimer's disease and depression.

CNN: Alzheimer's or depression: Could it be both?

Scientists know the Universe is governed by 13 fundamental constants of physics, and the relationship between the volume of the Earth and the Sun is 1310.

FORBES: Lucky Thirteen: Trends for 2013

NASA-watcher at the Federation of American Scientists, means that the events of the next year, and in particular the relationship between the Russian and American presidents, will be crucial to the space station's future.

ECONOMIST: The International Space Station: Milestone or millstone? | The