As the missile nears its target, the Digital Scene Matching Area Correlation system takes over.

BBC: Tomahawk cruise missile

Ms Parcak found a precise correlation between settlement patterns in her study area and climate change.

ECONOMIST: Climate change and civilisation

To some extent, their hopes were warranted: The growth correlation between Germany and other euro-area economies has risen sharply since they adopted the common currency.

WSJ: Troubles in Euro Zone Offer Chance to Fix Its Flaws