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46 articles from PhysOrg

Hydrogen masers reveal new secrets of a massive star

While using the Atacama Large Millimeter/submillimeter Array (ALMA) to study the masers around oddball star MWC 349A scientists discovered something unexpected: a previously unseen jet of material launching from the star's gas disk at impossibly high speeds. What's more, they believe the jet is caused by strong magnetic forces surrounding the star.

Scientists find pair of black holes dining together in nearby galaxy merger

While studying a nearby pair of merging galaxies using the Atacama Large Millimeter/submillimeter Array (ALMA)—an international observatory co-operated by the U.S. National Science Foundation's National Radio Astronomy Observatory (NRAO)—scientists discovered two supermassive black holes growing simultaneously near the center of the newly coalescing galaxy.

Want natural food dye? Amaranth delivers, according to study

Artificial food dyes have been linked to multiple health concerns, including hyperactivity in children, allergies, and certain cancers. The science isn't settled and the Food and Drug Administration says color additives are safe, but consumers are nonetheless clamoring for natural alternatives.

Two studies identify new strategies for insect control

Mosquitoes spread several diseases, among them malaria and dengue virus. In 2020, about 241 million cases of malaria occurred worldwide, with a few more million cases occurring in 2021. Nearly half the world's population lives in regions where contracting dengue virus is a risk. Insects also destroy a third of agriculture.

Smallpox has plagued humans since ancient Egyptian times, new evidence confirms

Smallpox was once one of humanity's most devastating diseases, but its origin is shrouded in mystery. For years, scientific estimates of when the smallpox virus first emerged have been at odds with historical records. Now, a new study reveals that the virus dates back 2,000 years further than scientists have previously shown, verifying historical sources and confirming for the first time that the...

How the 'Kimchi premium' on crypto affects overseas remittances

The "Kimchi premium" is a term used to refer to the gap between the price of bitcoins in South Korean versus Western exchanges. This difference, which was first observed in 2016, is caused due to the high demand for a limited supply of bitcoins. The Kimchi premium is not constant, but when it appears, bitcoins can be as much as 50% more expensive in South Korea.

New study reveals wide diversity of galaxies in the early universe

New data from the James Webb Space Telescope (JWST) have revealed that the structures of galaxies in the early universe were much more diverse and mature than previously known. Scientists recently compared images of hundreds of galaxies taken by JWST for the Cosmic Evolution Early Release Science (CEERS) Survey with corresponding images previously taken by the Hubble Space Telescope and presented...

A new method to evaluate thermoelectric materials

Working with one of the world's preeminent thermoelectric materials researchers, a team of researchers in the Clemson Department of Physics and Astronomy and the Clemson Nanomaterials Institute (CNI) has developed a new, fool-proof method to evaluate thermoelectric materials.