From the ediorial board

“25th anniversary of the Physics-Uspekhi website” Phys. Usp. 63 1–1 (2020)

Reviews of topical problems

G.V. Fetisov “X-ray diffraction methods for structural diagnostics of materials: progress and achievements” Phys. Usp. 63 2–32 (2020)

S.Ya. Vetrov, I.V. Timofeev, V.F. Shabanov “Localized modes in chiral photonic structures” Phys. Usp. 63 33–56 (2020)

Methodological notes

S.V. Goupalov “Classical problems with the theory of elasticity and the quantum theory of angular momentum” Phys. Usp. 63 57–65 (2020)

Conferences and symposia

“X-ray optics: how and what is to be seen (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 22 May 2019)” Phys. Usp. 63 66–66 (2020)

N.I. Chkhalo, I.V. Malyshev, A.E. Pestov, V.N. Polkovnikov, N.N. Salashchenko, M.N. Toropov “Diffraction limited X-ray optics: technology, metrology, applications” Phys. Usp. 63 67–82 (2020)

V.N. Polkovnikov, N.N. Salashchenko, M.V. Svechnikov, N.I. Chkhalo “Beryllium-based multilayer X-ray optics” Phys. Usp. 63 83–95 (2020)

Letters to the editors

M.L. Shmatov “Once again on the Gatchina discharge and ball lightning (comments on G.D. Shabanov's paper "On the possibility of making natural ball lightning using a new pulse discharge type in the laboratory" [Phys. Usp. 62 92 (2019); Usp. Fiz. Nauk 189 95 (2019)])” Phys. Usp. 63 96–98 (2020)

G.D. Shabanov “On relation between theoretical and experimental components in the papers on ball lightning (reply to M.L. Shmatov's comments [Usp. Fiz. Nauk 190 107 (2020)] on the paper "On the possibility of making natural ball lightning using a new pulse discharge type in the laboratory" [Phys. Usp. 62 92 (2019); Usp. Fiz. Nauk 189 95 (2019)])” Phys. Usp. 63 99–100 (2020)

Physics news on the internet

Yu.N. Eroshenko “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 101–102 (2020)