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• An article about the Gravelines nuclear power plant in northern France said it had become the first in the world to produce more than one terawatt-hour of electricity. That should have been one petawatt-hour, equal to 1,000bn kWh. A petawatt is 1,000 terawatts (Anxiety grows over use of nuclear energy, 24 March, page 29).
• Aaron Burr was never president of the United States, contrary to the clue and answer to 20 down, Quick crossword No 12,757 (31 March, page 28, G2). He ran on the Republican ticket with Thomas Jefferson in 1800 and tied with him in the electoral college. The tie was broken on the 36th ballot in the House of Representatives, with Jefferson successful and Burr becoming vice-president.
• A financial analysis referred to Greece, Italy and Portugal being hammered deeper into crisis by their European partners. That should have been Greece, Ireland and Portugal (Europe needs a way out of the debt trap, 28 March, page 28).
