In a March 17 "Jurisprudence," Tim Wu referred to nicotine as "cancerous and as addictive as crack." In fact, nicotine is not itself cancerous—other substances in cigarettes are.

A March 16 "Sports Nut," due to an editing error, originally and incorrectly included the logo of the Penn State Nittany Lions, not that of the Pennsylvania Quakers. Also, the University of Tennessee at Chattanooga is the second-largest school in the University of Tennessee system, not the second-largest in the state of Tennessee.

In a March 15 "Explainer," Daniel Engber originally stated that Dashiell Hammett was jailed in 1951 for contempt of Congress. In fact, he was jailed for contempt of court. He didn't testify before Congress until 1953.

In a March 15 "Today's Papers," Sam Schechner originally and incorrectly credited the WSJ for scooping a story about the Bush administration's decision to sell F-16 fighters to Pakistan. In fact, the Dallas Morning News broke the story on March 12.

In "Chatterbox" columns posted on March 15 and March 17, Timothy Noah erroneously credited to Ari Fleischer various complaints about "the liberal press." In fact, the complaints cited, though quoted with approval in Fleischer's new book, which calls them "breathtakingly frank," originated in an essay that appeared Feb. 10, 2004 in ABC's Web log, "The Note."

In a March 14 "Hey, Wait a Minute," Ryan Grim wrote that 10 million hits of acid could have dosed the nations of Chile and Uruguay once. About 20 million people live in those two countries, so he erred by a factor of two. The sentence has been rewritten to state that 10 million hits of acid could dose the nation of Cuba about once. (Cuba's population is about 11 million.)

In a March 11 "Human Nature" article, William Saletan initially implied that Bill Hurlbut, a member of the President's Council on Bioethics, sought to generate human embryonic stem cells by deleting a gene called cdx2 during the cloning process. Cdx2 is the gene Hurlbut proposes to delete in preliminary mouse experiments. If those experiments work, Hurlbut would then try to identify and delete an equivalent gene in humans.

In the March 11 "Television," Dahlia Lithwick misspelled actress Candice Bergen's name.

In a March 11 "Today's Blogs," David Wallace-Wells mistakenly reported that a fatwa against Arab leaders aiding the United States had been issued nearly simultaneously with a fatwa issued against Osama Bin Laden. In fact, the edict was issued in 2003.

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