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The latest Physics World Weekly podcast looks at the science of two very different types of mining. Susanne Köhler of Denmark's Aalborg University talks about blockchain technology and the vast energy and computer-hardware requirements of Bitcoin mining. Also on hand is Kevin Telmer who talks about how new technologies can help the subsistence miners who produce about 20% of the world's gold supply. Hamish Johnston, online editor, Physics World

THIS WEEK'S HEADLINES

2D materials, States of matter | Research update Electrons in twisted graphene 'freeze' when heated Entropy measurements reveal an unexpected phase transition analogous to the Pomeranchuk effect in helium-3 Diagnostic imaging | Research update Ultrafast ultrasound maps tiny blood vessels deep in the human brain Transcranial ultrafast ultrasound localization microscopy of injected microbubbles maps human brain vasculature with microscopic resolution Planetary science | Research update X-ray emissions from Uranus are detected for the first time Source of three faint signals remains a mystery Characterization and modelling, Structure and properties | Research update Fast electrons catch badly behaved quantum dots in the act New technique allows scientists to pinpoint causes of low light emission in real time and could pave the way for more efficient devices 2D materials | Research update Twist direction influences electron behaviour in magnetic bilayers Electrons in certain layered 2D materials act differently depending on whether the layers are twisted left or right

EXPLORE MORE

Business and innovation, Environment and energy | Podcast New technology for artisanal gold miners and the pros and cons of blockchain In this podcast we talk about reducing mercury use in gold production and the environmental impact of Bitcoin mining Astronomy and space, Education and outreach, Personalities | Opinion and reviews Reaching for Mars: advice for realizing the biggest dreams Andrew Glester reviews Dream Big: How to Reach for Your Stars by Abigail Harrison Projects and facilities | Analysis How the Daya Bay experiment helped China build a neutrino legacy Ling Xin examines the legacy of the recently closed Daya Bay Reactor Neutrino Experiment and the future of neutrino physics in China Nuclear physics | Feature Celebrating a century of nuclear isomers A century after "nuclear isomers" were discovered, Philip Walker and Zsolt Podolyák explore these long-lived, excited nuclear states Projects and facilities | Opinion and reviews Crisis in a lockdown: how NIST coped with a radiation leak Robert P Crease describes how news of a radiation leak at a US neutron facility was handled in today's online, networked and locked-down world

OUR LATEST WEBINARS You can explore our full selection of webinars on our website.

Medical physics, Sponsored | Webinar Independent QA and the necessity of data access Join the audience for a live webinar on 12 May 2021 sponsored by Sun Nuclear Corporation Materials, Sponsored | Webinar Synchrotron characterization of buried interfaces in solid-state batteries Join the audience for a live webinar on 5 May 2021 sponsored by Hiden Analytical, in partnership with The Electrochemical Society

INNOVATION SHOWCASES You can explore our full selection of innovation showcases on our website.

Raman imaging microscopy: the analytical multi-tool Watch today's webinar sponsored by WITec exploring the principles of 3D Raman imaging. Raman spectroscopic imaging is a powerful, versatile and increasingly common microscopy technique that can quickly identify molecules in a sample and visualize their distribution in three dimensions. This fast, non-destructive and label-free chemical characterization method offers enormous potential to physicists in many fields of research.

The next generation of qubit control Would you like to achieve high-fidelity control of superconducting or spin qubits without spending time on mixer calibration? Join Zurich Instruments' virtual launch event and find out how the SHFSG Signal Generator sets new standards in spectral purity and stability while helping you to generate fast and high-fidelity gate sequences. The launch event will include an overview of the instrument and practical demonstrations of its capabilities.

VACANCIES FROM PHYSICS WORLD JOBS

Particle Physicist, Germany Pulsed Electromagnetic Systems Engineer, France Technical Graduate Program: Mechanical Engineering/Physics – Thermal and Flow Specialist, Netherlands Detector Physicist (m/f/d), Germany Senior Optical Engineer in Astronomical Instrumentation (HARMONI), UK Cryo Engineers, Finland Postdoctoral Research Associate, US Mechanical Engineer (Multiple Openings), US Neutron Data and Computing Program Manager, US Lecturer in Data Intensive Science, UK

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