REVIEWS OF TOPICAL PROBLEMS 

Excitons and trions in two-dimensional semiconductors based on transition metal dichalcogenides

M V Durnev, M M Glazov

825

Plasmon nanolaser: current state and prospects

V I Balykin

846

PHYSICS OF OUR DAYS 

The robot and the human. Where's their similarity limit?

G R Ivanitskii

871

METHODOLOGICAL NOTES 

Operator derivation of the quasiclassical Green's function

P A Krachkov, A I Milshtein

896

On the properties of the `potential' neutron dispersion law in a refractive medium

A I Frank

900

CONFERENCES AND SYMPOSIA 

Neutrino and nuclear astrophysics: the 100th anniversary of the birth of Academician G T Zatsepin (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 24 May 2017) 

902

Greisen–Zatsepin–Kuzmin effect: top-down and bottom-up view

M I Panasyuk

903

Creation of the FIAN Neutrino Laboratory and underground laboratories

O G Ryazhskaya

912

G T Zatsepin and the birth of gamma-ray astronomy

A S Lidvansky

921

Physics news on the Internet (based on electronic preprints)

Yu N Eroshenko

923