Yet when Harlow tested that approach, the monkeys actually made more errors and solved the puzzles less frequently.

WSJ: 'Drive' Excerpt by Daniel H. Pink

According to NASA flight surgeon Smith Johnston, studies in Anchorage, Alaska showed that hospital staff made more medical errors during the darkest times of the year.

MSN: Space station to get new insomnia-fighting light bulbs

He broke Ferrero's serve six times, hit more than twice as many winners as Ferrero and made just three more errors.

WSJ: Who Can Upset Tennis's Untouchables?

In all three tests Dr Smith found that low-power participants made 2-5% more errors than their high-power counterparts.

ECONOMIST: Cognitive disenhancement

Rovers lacked discipline, made too many errors and should have been more than 12-0 down at half-time after tries from Andy Lynch and Elliot Whitehead.

BBC: Bradford 40-4 Hull KR

Hamid Karzai, the president, who has many times pleaded with America to take more care to avoid killing Afghan civilians, wants its troops to be made accountable for any errors they may make.

ECONOMIST: Another blow to the war to win hearts and minds