The week in physics: Night-sky contamination; Getting a job in publishing; Hand claps

The week in physics: 31 March–April 4 Threats to the dark and quiet sky Night-sky contamination is a problem not just in the visible spectrum, and it's getting worse. John Barentine How I found a job in science publishing Eight months. One hundred and ten applications. Eleven interviews. One job! Hannah H. Means ADVERTISEMENT Industry Interviewees Needed: Tariffs and Manufacturing Physics Today's science policy colleagues are seeking to interview industry representatives about how tariffs are affecting physics equipment manufacturing. If you are willing to speak, please email fyi@aip.org to be considered as a source. From the vault: September 1993 Boltzmann's entropy and time's arrow Given that microscopic physical lows are reversible, why do all macroscopic events have a preferred time direction? Boltzmann's thoughts on this question have withstood the test of time. Joel L. Lebowitz Modeling hand clapping High-speed video helps reveal the acoustics. Ryan Dahn From the April issue Q&A: Frank Close probes quarks and popularizes science He has written books on quarks, protons, spies, nuclear threats, and more. Toni Feder Post a Job Get Job Alerts Browse All Jobs Department of Physics—Postdoctoral Scholar Pennsylvania State University (State College, PA) View Job Assistant, Associate or Full Professor—Photonics The Graduate Center, CUNY (New York, NY) View Job Assistant Professor of Physics University of Minnesota, Morris (Morris, MN) View Job QUC Research Fellow Positions in Condensed Matter and Computational Materials Sciences KIAS (Seoul, South Korea) View Job Research Assistant in the field of electrical engineering (optical communications engineering) Federal Institute for Materials Research and Testing (Berlin, Germany) View Job Assistant Teaching Professor-Lab Coordinator Florida International University (Miami, FL) View Job Physics Today is published by the American Institute of Physics. To manage your AIP email preferences and newsletter subscriptions, click here. Or unsubscribe from all AIP emails. © 2025 American Institute of Physics. Physics Today 1 Physics Ellipse College Park, MD 20740-3842 +1 301 209 3100