A New York Times article notes the alarmingly high rate of retractions for articles in scientific journals.
… [The] scramble to publish in high-impact journals may be leading to more and more errors. Each year, every laboratory produces a new crop of Ph.D.’s, who must compete for a small number of jobs, and the competition is getting fiercer. In 1973, more than half of biologists had a tenure-track job within six years of getting a Ph.D. By 2006 the figure was down to 15 percent