• The second researcher mentioned in the report “Universe weighs in surprisingly light” (8 July, p 14) is Michael Heyl of the German Aerospace Centre in Bonn, and not “Martin Heyl, at the University of Bonn”.
• In our item on eye implants (15 July, p 28) we relocated Brown University to New York. It is and remains in Providence, Rhode Island.
• The article on damage to coral reefs (8 July, p 29) referred to a “34 to 37 per cent” ocean salinity range. That would definitely be damaging: we should have said 3.4 to 3.7 per cent.
• Our correction of a figure for the amount of water on the planet (15 July, p 23) was itself missing some zeros. The UN Environment Programme estimates that there are about 1400 million cubic kilometres (see www.unep.org/vitalwater/01.htm).
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