Search and Discovery
Until now x-ray images with the revealing contrast afforded by dark-field techniques could only be gotten at synchrotron light sources.
A magnet has two poles—north and south. But in a frustrated magnetic state known as spin ice, the familiar magnetic dipole can split into two magnetic charges that independently diffuse around the crystal.
Issues and Events
Children at K–12 levels learn physics and engineering by assembling their own working underwater vehicles.
Determining how animals orient themselves using Earth’s magnetic field can be even more difficult than finding a needle in a haystack. It is like finding a needle in a stack of needles.
One hundred years ago, Heike Kamerlingh Onnes first liquefied helium in a cryogenic laboratory whose excellence and scale were unparalleled. Creating, staffing, and running the Leiden laboratory required more than just scientific skill.
Inflationary cosmology is elegant and can claim significant predictive successes. But its attendant difficulties have motivated competing scenarios that also agree with observation.
The light-emitting diodes that sit at the heart of integrated solid-state lighting systems, or luminaires, allow for novel applications but also present engineers with particular challenges.