In the first phase of the study, the researchers showed that their volunteers (Surrey university students) were slower to notice a target shade of blue when it flashed up against a blue background of a different hue than when it flashed up against a green background.

ECONOMIST: Psychology

For example, they say criminals skirt background checks, so expanding the system would miss the main target of the legislation.

CNN: Obama still backs new gun ban; top senator less certain

The background turns from green to yellow as the order nears the target time and to red when it has exceeded it.

NEWYORKER: Big Med

Competitors shoot from the prone position at a paper or plastic target on a wooden frame, with a round, black aiming mark on a white background.

BBC: HOW FULL BORE EVENTS UNFOLD

Much of the campaign involved sending spear-phishing emails, where an unsuspecting target would click on a link, activating a program that would then runs quietly in the background of their computer network.

FORBES: China Thought To Be Behind Global Cyber-Espionage Campaign That Hit UN, Olympic Committee