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Physicists break record for laser-electron interaction

New experiment beats efficiency of free-electron lasers by turning 30% of electron-beam energy into light

US unfazed by Russia ending reactor co-operation

US Department of Energy says Russia's decision to end pact to convert research reactors will have "no practical impact"

Flash Physics: 3D stars shrink when hot, new laser sensor for gases, tracking solar waves

Today's selection of need-to-know updates from the world of physics

Societies seek action on rising helium prices

New report looks to address crisis by working with vendors to develop helium-saving technologies

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White papers

This channel comprises content supplied by vendors.

An introduction to the Physics Package from Maple

A computational tool that can handle a wide range of physics calculations to further decrease the reliance on pencil and paper. A white paper from Maplesoft

Tunable, narrow-bandwidth mid-infrared laser sources for compact trace gas analysis

Laser-based photoacoustic spectroscopy using the Cobolt Odin™ tunable mid-infrared laser. A white paper from Cobolt, a Hübner Group company

2D Materials celebrates Impact Factor: 9.611


We are delighted to announce that 2D Materials has received a first Impact Factor of 9.611. We are very grateful to our Editorial Board, authors and readers for embracing 2D Materials and we hope to continue to serve researchers working in this exciting field in the future.

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Recipe for success with topological materials

Podcast Hamish Johnston visits Beijing on a hunt for the elusive Weyl fermions

What can we learn from ultrahigh energy cosmic rays?

Video Gordon Thomson introduces the Telescope Array experiment in Utah

What can you do with a Weyl semimetal?

Video Zahid Hasan explains why semimetals containing Weyl fermions could be ideal for examining a variety of theories



Taking the long view

Despite talk of skills shortages, most graduates in scientific disciplines take jobs outside science. Patrick White and Emma Smith reflect on why this is and what it means for the long-term career prospects of physics graduates


The descent of mass

Jon Cartwright talks to the physicists who are hoping to find a flaw in the equivalence principle



Unknown unknowns

Robert P Crease says people who raise “unknown unknowns” to promote a particular course of action are doing a disservice to science


Gender balance, one woman at a time

Can a female teacher help convince girls to study advanced physics? Physics teacher Debbie Hayton had a novel way of finding out



Finding the right boundaries

Roger Penrose’s book on “fashion, faith and fantasy” in physics asks excellent questions, but reviewer Chanda Prescod-Weinstein finds some of the answers wanting

Innovation & industry

Focus issue

Physics World Focus on Vacuum Technology

Free to read: Challenges, applications and solutions

For the latest features and products for those interested in innovation and industry, see our special sections on: