• The GridION device will be capable of sequencing a human genome in several hours, while the smaller MinION USB sequencing device is not designed to sequence entire genomes, contrary to the over-optimistic numbers we reported (25 February, p 23).
• The phrase “right to pursue happiness” appears in the US Declaration of Independence, not in the Constitution as we claimed in an earlier correction (11 February, p 33).
• Oops: salt doesn’t evaporate at terrestrial temperatures. We should have reported geologist Paul Knauth as saying that only once “large quantities of salt were safely locked away in land-based deposits could complex life take off in the oceans” (18 February, p 6).
