In the April 28 "Explainer," Juliet Lapidos wrote that the demand for doctors in 2020 will be many tens of thousands less than we'll have. She meant "more."

In the April 28 "Medical Examiner," Sydney Spiesel incorrectly wrote that the Mexican swine flu is a combination of human, avian, and pig flus. Though the strain's genetic material came from pig, human, and avian flu, the virus came only from a pig.

In an April 28 "Politics," John Dickerson mistakenly said Sen. Arlen Specter ran for Pennsylvania state attorney general in 1965. It was Philadelphia district attorney.

In the April 28 "Science," Daniel Engber incorrectly described sucrose as a mixture of 50 percent fructose and 50 percent glucose. It is a disaccharide—a compound of the two.

In the April 27 "Jurisprudence," Rick Hasen incorrectly stated that a political division of a state may not ask for a bailout from the preclearance provision of the Voting Rights Act. A political subdivision that registers voters may ask. He also stated that the Supreme Court struck down the Violence Against Women Act in 1997. The court struck down the Religious Freedom Restoration Act in 1997, and VAWA in 2000.

In the April 27 "Medical Examiner," David Dobbs miscalculated the potential kill rates of swine flu.

In the April 20 " Ad Report Card," Seth Stevenson stated that Microsoft's "Mojave Experiment" ad was the work of the agency Crispin Porter + Bogusky. It was the work of the agency Bradley and Montgomery.

In an April 13 " Sports Nut," Robert Weintraub stated that stewards at the Masters golf tournament quiet crowds with signs reading, "Hush y'all." Such signs are typically associated with the Bell South Classic, not the Masters.

In an April 1 " Medical Examiner," Sydney Spiesel misidentified the Illinois town in which a manufacturing plant was located.

If you believe you have found an inaccuracy in a Slate story, please send an e-mail to corrections@slate.com, and we will investigate. General comments should be posted in "The Fray," our reader discussion forum..