Biological small angle scattering: by Eaton E. Lattman, Thomas D. Grant and Edward H. Snell (IUCr Monographs on Crystallography 29, Oxford Science Publications), Oxford University Press, 2018, 268 pp., £65, ISBN 978-0-19-967087-1, doi:10.1093/oso/9780199670871.001.0001. Issue 4 (2nd October 2019)