• As of 2012, the UK Medical Practitioners Tribunal Service hears cases filed by the UK General Medical Council concerning doctors’ fitness to practise (10 October, p 4).
• We missed the measure of the NPL, which stands for the National Physical Laboratory. And caesium-133 is the only isotope of this element that is not radioactive; the second is in fact defined by “hyperfine splitting in the ground state” – the frequency of light emitted for a transition between two of its electron states (3 October, p 38).
