• The Crab nebula is in the constellation of Taurus not, as we stated, Orion (7 March, p 14).
• The materials used to print 3D images of bones are tricalcium phosphate and poly(lactic-co-glycolic acid), not tri-calcium triphosphate and polylactic acid (7 March, p 13).
• In “Surviving in a warmer world” (28 February, p 28) we said that “9 million people would need 18,000 square kilometres of land to live on”. That figure should, of course, have been 9 billion people, and the area of land 180,000 square kilometres.
• The DOI reference to Daniel Campbell’s research into the MET gene should have been 10.1542/peds.2008-0819 (7 March, p 15).
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