• In the feature “Friend or foe?” (3 December, p 46), the salt content of a small pot of yogurt should have been given as 0.4 grams.
• The story on the discovery of exoplanet Kepler-22b (10 December, p 4) should have said that if it is at the lighter end of the possible mass range for a planet 2.4 times as wide as Earth, it might be gassy like Neptune, and if at the heavier end, it might be rocky.
