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  • A fundamental technical challenge in the analysis of network data is the automated discovery of communities — groups of nodes that are strongly connected or that share similar features or roles. In this Comment we review progress in the field over the past 20 years.

    • Santo Fortunato
    • Mark E. J. Newman
    Comment
  • Across the world, decisions on investment and policy are made under the assumption of continuous economic expansion. Fundamental physical limits may soon put an end to this phase of development, as foreshadowed by the 1972 report The Limits to Growth.

    • Thomas W. Murphy Jr
    Comment
  • Emerging quantum technologies pose new measurement challenges, but also offer previously unknown measurement solutions. National metrology institutes are playing a leading role in this fast evolving world.

    • Alexander Tzalenchuk
    • Nicolas Spethmann
    • Barbara L. Goldstein
    Comment
  • As we celebrate the ten-year anniversary of the discovery of the Higgs boson, CERN’s Director-General at that time reminisces about the years leading up to this milestone.

    • Rolf-Dieter Heuer
    Comment
  • Against the backdrop of various philosophical accounts, this Comment argues for the need of a human rights approach to scientific progress, which requires us to rethink how we view scientific knowledge.

    • Michela Massimi
    Comment
  • Scientists have long preferred the simplest possible explanation of their data. More recently, a worrying trend to favour unnecessarily complex interpretations has taken hold.

    • Igor Mazin
    Comment
  • Methods for studying Bose–Einstein condensation in ultracold gases have been under development for over 40 years. A highly sophisticated suite of techniques has emerged from rapid technological advances that show no sign of slowing down.

    • Jook Walraven
    Comment
  • Having long played the role of collaborators with other, more renowned, institutions, historically disadvantaged South African universities are now challenging the status quo — and emerging as leaders.

    • José Nicolás Orce
    • Sifiso Ntshangase
    Comment
  • The United Nations Sustainable Development Goals outline a roadmap towards a more equitable future for humanity. Along with other scientists, physicists have long made valuable contributions to this endeavour.

    • Joseph J. Niemela
    Comment
  • Undergraduate labs are more effective and more positive for students if they encourage investigation and decision-making, not verification of textbook concepts.

    • Emily M. Smith
    • N. G. Holmes
    Comment
  • Scientific progress has always been driven by the ability to build an instrument to answer a specific question. But spreading the news of how to replicate that tool is an evolving art, ripe for an open-source revolution.

    • Georg E. Fantner
    • Andrew C. Oates
    Comment
  • Passing a supercurrent through a topological material can highlight the existence of higher-order boundary states, and may lead to applications in topological superconductivity.

    • Yaojia Wang
    • Gil-Ho Lee
    • Mazhar N. Ali
    Comment
  • Muon colliders offer enormous potential for the exploration of the particle physics frontier but are challenging to realize. A new international collaboration is forming to make such a muon collider a reality.

    • K. R. Long
    • D. Lucchesi
    • V. Shiltsev
    Comment
  • Methodology adapted from data science sparked the field of materials informatics, and materials databases are at the heart of it. Applying artificial intelligence to these databases will allow the prediction of the properties of complex organic crystals.

    • R. Matthias Geilhufe
    • Bart Olsthoorn
    • Alexander V. Balatsky
    Comment
  • Physicists and biologists have different conceptions of beauty. A better appreciation of these differences may bring the disciplines closer and help develop a more integrated view of life.

    • Ben D. MacArthur
    Comment
  • #BlackInPhysics Week aimed to build community among physicists by celebrating, supporting and increasing the visibility of Black physicists. The week accomplished all of this, and more.

    • Charles D. Brown II
    • Eileen Gonzales
    Comment
  • The uncertainty associated with epidemic forecasts is often simulated with ensembles of epidemic trajectories based on combinations of parameters. We show that the standard approach for summarizing such ensembles systematically suppresses critical epidemiological information.

    • Jonas L. Juul
    • Kaare Græsbøll
    • Sune Lehmann
    Comment
  • Scaling arguments provide valuable analysis tools across physics and complex systems yet are often employed as one generic method, without explicit reference to the various mathematical concepts underlying them. A careful understanding of these concepts empowers us to unlock their full potential.

    • Marc Timme
    • Malte Schröder
    Comment
  • The particle physics community refreshes the roadmap for the field in Europe, taking into account the worldwide context, in the so-called European Strategy for Particle Physics update, which happens every seven years.

    • Fabiola Gianotti
    • Gian Francesco Giudice
    Comment Open Access
  • Since the 1950s, international cooperation has been the driving force behind fusion research. Here, we discuss how the International Atomic Energy Agency has shaped the field and the events that have produced fusion’s global signature partnership.

    • Matteo Barbarino
    Comment