Letter: For the record - 10 March 2018

Published 7 March 2018

• The team refining the mass of the proton measured a property of this subatomic particle called the cyclotron frequency (13 January, p 7).

Issue no. 3168 published 10 March 2018

Sign up to our weekly newsletter

Receive a weekly dose of discovery in your inbox. We'll also keep you up to date with New Scientist events and special offers.