In a June 14 "Big Idea," Jacob Weisberg originally misstated the type of equestrian event in which Christopher Reeve was injured. It was the cross country.
In a June 13 "Explainer," Daniel Engber stated that helium changes your voice by altering the vibration of your vocal cords. This does have an effect, but it's not as important as the shift in the resonant frequencies of your vocal tract.
In a June 12 "Explainer," Daniel Engber stated that the crash of EgyptAir 990 took place in 2002. It happened in 1999.
In a June 12 "Press Box," Jack Shafer made Nocera plural by spelling it Noceri. Latin pedants inform Slate that the plural form of Nocera is Nocerae, so the copy has been changed accordingly.
In a June 10 "Explainer," Nick Schulz originally misstated the day of Brazil's opening World Cup game. It is June 13, not June 12.
In a June 8 "Jurisprudence," by Dahlia Lithwick, Tom Parker is described as a former Justice of the Alabama Supreme Court. Parker is in fact still a justice on that court. He failed in his bid to be its Chief Justice.