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Lunar New Year 2023Happy Lunar New Year! Today's annual Doodle celebrates the Lunar Calendar’s first day of the new year and features a rabbit and Lunar New Year symbols including peach blossoms, lanterns, a red envelope, and firecrackers.
Um estudo do céu do hemisfério sul, realizado por astrônomos responsáveis pela Pesquisa de Plano de Câmera de Energia Escura (DECaPS2), realizou o mapeamento e a identificação de mais de 3 bilhões de corpos celestes. Os dados da pesquisa foram publicados no The Astrophysical Journal.
Enquanto alguns equipamentos astronômicos perscrutam os confins do universo, outros observam a nossa vizinhança e o nosso lar.
Imagem: DECaPS2/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA/E. Slawik/M. Zamani/D. de Martin
Em um mapeamento histórico, astrônomos conseguiram observar, mapear e identificar 3,32 bilhões de corpos celestes, na nossa Via Láctea./.../
Democracy is broadly understood to mean ‘rule by the people’. In practice, it is often defined as people choosing their leaders in free and fair elections. Other definitions go beyond this. For example, some of them see democracy as people having additional individual rights and being protected from the state. Democracy gives citizens the right to influence important decisions over their own lives and allows them to hold their leaders accountable. But it can have other benefits too: democratic countries seembetter governedthan autocracies, seem togrow faster, and foster more peaceful conductwithinandbetweenthem. On this page, you can find data, visualizations, and writing on how democracy has spread across countries, how it differs between them, and whether we are moving towards a more democratic world.
The emergence of disease-causing bacteria that are resistant to antibiotics is often attributed to the overuse of antibiotics in people and livestock. But researchers have homed in on another potential driver of resistance: antidepressants. By studying bacteria grown in the laboratory, a team has now tracked how antidepressants can trigger drug resistance./.../
The Cause of Depression Is Probably Not What You Think
By JOANNA THOMPSON
Depression has often been blamed on low levels of serotonin in the brain. That answer is insufficient, but alternatives are coming into view and changing our understanding of the disease.
Mathematicians Find an Infinity of Possible Black Hole Shapes
By STEVE NADIS
In three-dimensional space, the surface of a black hole must be a sphere. But a new result shows that in higher dimensions, an infinite number of configurations are possible.
How Quantum Physicists ‘Flipped Time’ (and How They Didn’t)
By CHARLIE WOOD
Two teams have made photons act as if time were simultaneously flowing in two directions. The experiments demonstrate a way to potentially boost the performance of quantum devices.
The Basic Algebra Behind Secret Codes and Space Communication
By PATRICK HONNER
Whether you’re passing secret notes in class or downloading images from a space probe, Reed-Solomon codes offer an ingenious way to embed information and correct for errors.
I Saw the Sign Humans can correctly guess the meaning behind the gestures made by wild chimps and bonobos, reports Victoria Gill for BBC News. Researchers think that our ancestors used similar gestures to communicate before they developed language. Gestures are not only useful tools for communication. Mounting evidence suggests that they serve an important role in perception and cognition, too. Raleigh McElvery wrote about this for Quanta in 2019.
Io's Ire A recent eruption on Jupiter’s intensely volcanic moon Io emitted a mix of chemicals that startled observers, reports Oliver Whang for The New York Times. Studying it could help scientists better understand Io’s volcanoes and their interactions with Jupiter. Gas emitted by Io’s volcanoes can get captured by Jupiter’s magnetic fields and power the planet’s auroras. In 2021 Robin George Andrews reported for Quanta that these auroras are why Jupiter is unexpectedly warm.
Scientists are starting to detect clots in long COVID patients’ smallest blood vessels—which might help explain the condition’s debilitating symptoms.
BYPRIYANKA RUNWALPUBLISHED JANUARY 26, 2023
For more than two years, scientists have been trying to understand why millions of people across the world are experiencing lingering symptoms despite recovering from their COVID-19 infection. They’ve proposed several hypotheses including the presence of microclots—tiny blood clots that can block capillaries and potentially affect blood and oxygen flow.
In a 2021 study, physiologist Etheresia Pretorius at theStellenbosch University in South Africa and her colleagues were the first to suggest that microclots may be linked to this debilitating condition called long COVID. In a follow-up study, she and her colleagues showed that the SARS-CoV-2 spike protein triggers the formation of such clots, which the body’s natural clot-busting process doesn’t seem to break down easily.
This finding has led some scientists in the United States, with guidance from Pretorius, to test people with long COVID for microclots. Lisa McCorkell, co-founder of the long COVID-focused Patient-Led Research Collaborative, was thrilled when she heard the news last year.
IN THE SPOTLIGHT
IMAGE BY NASA, ESA, CSA, M. ZAMANI (ESA/WEBB)
Finding ancient galaxies: NASA’s James Webb Space Telescope has only been operational for six months, but it’s been busy. Already it has broken the record for farthest galaxies ever seen. These new galaxies are only 300 to 400 million years old and present new mysteries of the early universe, Nat Geo reports.READ MORE
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