■Preface
Reconsideration of Unaware Things
Daisuke Jido......329

■Overview Articles
A Measurement of Primordial Gravitational Waves from Inflation
―The Current Status of the Polarbear Experiment and Its Future
Yuji Chinone and Haruki Nishino......332

Nanofiber Cavity Quantum Electrodynamics System for Distributed Quantum Computation
Takao Aoki......339

■Researches
Chirality Conversion of Chiral Crystals under Grinding
Hiroyasu Katsuno and Makio Uwaha......349

Do Excitonic Insulators Exist?
Takashi Mizokawa and Kozo Okazaki......355

Non-Markovian Stochastic Processes in Physics―Field-Theoretical Solution to the Hawkes Process
Kiyoshi Kanazawa......360

■Crossroad
19 Years History of International Summer School by Center for Nuclear Study, University of Tokyo
Susumu Shimoura and Nobuaki Imai......365

■JPSJ Selected Papers in the Latest Issue......369

■PTEP Selected Papers in the Latest Issue......371

■La Toccata
New format of international conferences with COVID-19
Hideaki Obuse......375

■Memoir on the Screening Reviewed: FY 2020 Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science......377

■Book Reviews......381