Tag #Science

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spanish.china.org.cn

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Mar 20, 07:13

DESI Detects Potential Variation in Dark Energy, Challenging Standard Cosmological Model

The Dark Energy Spectroscopic Instrument (DESI) has found evidence suggesting dark energy, a force driving the universe's accelerating expansion, may not be a constant, challenging the Lambda-CDM model and potentially requiring modifications to existing theories of cosmology.

DESI Detects Potential Variation in Dark Energy, Challenging Standard Cosmological Model

The Dark Energy Spectroscopic Instrument (DESI) has found evidence suggesting dark energy, a force driving the universe's accelerating expansion, may not be a constant, challenging the Lambda-CDM model and potentially requiring modifications to existing theories of cosmology.

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How do DESI's observations challenge the Lambda-CDM model, and what alternative theories are being considered?

DESI's findings, based on three years of observations, indicate that the acceleration of the universe's expansion was greater approximately seven billion years ago and has slowed in the last 2.5 billion years. This challenges the standard cosmological model which assumes a constant dark energy, potentially requiring modifications or alternative theories.

welt.de

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Mar 20, 10:09

Annual Glacial Melt Loss Doubles Sea Level Rise, Threatens Global Resources

Glacial melt is causing a yearly loss of 273 billion tons of ice, contributing to a more than doubled sea level rise since 2006 and threatening coastal areas and freshwater resources; researchers are also discovering new microorganisms in melting glaciers.

Annual Glacial Melt Loss Doubles Sea Level Rise, Threatens Global Resources

Glacial melt is causing a yearly loss of 273 billion tons of ice, contributing to a more than doubled sea level rise since 2006 and threatening coastal areas and freshwater resources; researchers are also discovering new microorganisms in melting glaciers.

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Climate Action

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What are the immediate consequences of the 273 billion tons of annual glacial ice loss?

273 billion tons of ice are lost annually due to glacial melt, equivalent to 30 years of global water consumption at 3 liters per person daily," says glaciologist Michael Zemp. Rhone glacier water accounts for 15% of water entering Lake Geneva annually. The impact of snow and ice melt on groundwater is still under research.

dailymail.co.uk

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Mar 20, 01:12

Astronaut's 288-Day Space Mission Reveals Extreme Aging Effects

After a record-breaking 288-day space mission, astronaut Sunita Williams returned to Earth with significant physical changes, including complete hair whitening, muscle and bone loss, and facial gauntness, highlighting the extreme physiological stress of prolonged space travel and the need for furthe...

Astronaut's 288-Day Space Mission Reveals Extreme Aging Effects

After a record-breaking 288-day space mission, astronaut Sunita Williams returned to Earth with significant physical changes, including complete hair whitening, muscle and bone loss, and facial gauntness, highlighting the extreme physiological stress of prolonged space travel and the need for furthe...

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Good Health and Well-being

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What are the most critical long-term health implications of prolonged space travel, based on Williams's experience, and what measures are needed to address these risks in future missions?

Williams's experience underscores the need for further research into mitigating the effects of long-duration space travel on human health. Future missions, particularly those aiming for Mars, must prioritize countermeasures for bone loss, muscle atrophy, cardiovascular issues, and radiation-induced DNA damage to ensure astronaut safety and mission success. Long-term health consequences, such as increased cancer risk and accelerated aging, require focused investigation and preventative strategies.

gr.euronews.com

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Mar 20, 01:12

Household Air Pollution Caused 3.1 Million Deaths in 2021

Household air pollution from solid cooking fuels contributed to 3.1 million deaths globally in 2021, mostly in low-income countries, despite a decrease in global exposure; Sub-Saharan Africa had the highest exposure rate (78.8%), while high-income countries had only 0.4%.

Household Air Pollution Caused 3.1 Million Deaths in 2021

Household air pollution from solid cooking fuels contributed to 3.1 million deaths globally in 2021, mostly in low-income countries, despite a decrease in global exposure; Sub-Saharan Africa had the highest exposure rate (78.8%), while high-income countries had only 0.4%.

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What is the global impact of household air pollution in 2021, and what are its immediate health consequences?

In 2021, household air pollution caused 3.1 million deaths globally, with most occurring in low-income countries. This pollution, from cooking with fuels like kerosene, wood, and animal dung, contains particles entering the bloodstream via the lungs, causing various health issues.

theguardian.com

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Mar 20, 01:12

Dark Energy's Decline Challenges Universe's Fate

New data from the Dark Energy Spectroscopic Instrument (DESI) analyzing 15 million galaxies over 11 billion years suggests dark energy, a mysterious force opposing gravity, peaked when the universe was 70% of its current age and is now declining, challenging the prevailing cosmological model.

Dark Energy's Decline Challenges Universe's Fate

New data from the Dark Energy Spectroscopic Instrument (DESI) analyzing 15 million galaxies over 11 billion years suggests dark energy, a mysterious force opposing gravity, peaked when the universe was 70% of its current age and is now declining, challenging the prevailing cosmological model.

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What is the most significant finding from the DESI observations concerning dark energy and its implications for the universe's future?

Recent astronomical observations from the Dark Energy Spectroscopic Instrument (DESI) challenge the prevailing cosmological model. Measurements of 15 million galaxies across 11 billion years indicate that dark energy, previously believed to be constant, may have peaked when the universe was 70% of its current age and is now weakening. This contrasts with the standard model's prediction of constant dark energy driving accelerating expansion.

dw.com

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Mar 20, 01:12

Transgender Women in Sports: Ongoing Debate on Fair Competition

Recent studies show that transgender women retain some physical advantages over cisgender women in sports even after hormone therapy, sparking debates about fair competition and leading sports organizations to adjust participation rules; the optimal duration of hormone therapy remains unclear.

Transgender Women in Sports: Ongoing Debate on Fair Competition

Recent studies show that transgender women retain some physical advantages over cisgender women in sports even after hormone therapy, sparking debates about fair competition and leading sports organizations to adjust participation rules; the optimal duration of hormone therapy remains unclear.

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Gender Equality

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What are the key physiological differences between transgender women and cisgender women in athletic performance, and how do these differences impact the fairness of competition?

Even after hormone therapy, transgender women retain some physical advantages over cisgender women in sports, particularly in muscle strength and oxygen uptake, according to recent studies. However, these advantages are reduced, and some studies suggest performance equalizes after two years of hormone therapy. This has led to ongoing debates about fair competition and participation rules.", A2="Studies show that male puberty significantly impacts athletic performance, creating considerable differences between cisgender men and women. Transgender women, having undergone male puberty, retain some of these advantages even with hormone therapy, leading sports organizations to grapple with balancing inclusivity and fair competition. The optimal duration of hormone therapy for fair competition remains a subject of ongoing research.", A3="The debate about transgender women's participation in women's sports highlights the complex interplay between biological sex, gender identity, and athletic performance. Future research needs to focus on the long-term effects of hormone therapy, the influence of factors beyond hormones and puberty, and the development of inclusive yet fair competition guidelines. The impact on mental health of transgender athletes should also be considered. ", Q1="What are the key physiological differences between transgender women and cisgender women in athletic performance, and how do these differences impact the fairness of competition?", Q2="How do varying durations of hormone therapy affect the athletic performance of transgender women, and what implications does this have for participation rules in sports organizations?", Q3="Considering the complex interplay of biological factors, gender identity, and athletic performance, what are the ethical and practical challenges in creating truly inclusive and fair competition guidelines for transgender women in sports?", ShortDescription="Recent studies show that transgender women retain some physical advantages over cisgender women in sports even after hormone therapy, sparking debates about fair competition and leading sports organizations to adjust participation rules; the optimal duration of hormone therapy remains unclear.", ShortTitle="Transgender Women in Sports: Ongoing Debate on Fair Competition")) #Updated with correct parameters and values. No changes to the code itself. 2025-03-20 update. 2021-07-24 original article. Additional studies added in 2024 and 2025. Updated by Rayna Breuer. Edited by: Astrid Prange de Oliveira, Carla Bleiker, Chiponda Chimbelu and Rachel Baig.

theguardian.com

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Mar 20, 19:17

AI-Powered Weather Forecasting System Offers Dramatic Improvements in Speed and Efficiency

A Cambridge-led research team developed Aardvark Weather, an AI system for weather forecasting that is tens of times faster and uses thousands of times less computing power than conventional systems, potentially revolutionizing weather prediction globally.

AI-Powered Weather Forecasting System Offers Dramatic Improvements in Speed and Efficiency

A Cambridge-led research team developed Aardvark Weather, an AI system for weather forecasting that is tens of times faster and uses thousands of times less computing power than conventional systems, potentially revolutionizing weather prediction globally.

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Reduced Inequality

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How does Aardvark Weather's reduced computational demand and speed impact the accessibility and cost-effectiveness of accurate weather forecasting?

A new AI-based weather forecasting system, Aardvark Weather, drastically reduces the computational resources and time needed for accurate predictions. Instead of requiring supercomputers and large teams, a single researcher using a desktop computer can generate forecasts. This translates to significant cost savings and faster turnaround times for weather information.

abcnews.go.com

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Mar 20, 04:13

Dark Energy May Be Weakening, Challenging Universe's Fate

An international collaboration using the Dark Energy Spectroscopic Instrument (DESI) has found evidence suggesting dark energy, a force making up nearly 70% of the universe and accelerating its expansion, may be weakening, potentially leading to the universe's eventual collapse instead of continuous...

Dark Energy May Be Weakening, Challenging Universe's Fate

An international collaboration using the Dark Energy Spectroscopic Instrument (DESI) has found evidence suggesting dark energy, a force making up nearly 70% of the universe and accelerating its expansion, may be weakening, potentially leading to the universe's eventual collapse instead of continuous...

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What is the significance of the findings from the Dark Energy Spectroscopic Instrument regarding the nature of dark energy and its implications for the universe's future?

Scientists are exploring whether dark energy, comprising nearly 70% of the universe and accelerating its expansion, is a constant force or weakening. New data from the Dark Energy Spectroscopic Instrument (DESI) analyzing 15 million galaxies and quasars bolsters the hypothesis of weakening dark energy, though more evidence is needed for definitive proof. This challenges existing cosmological models.

abcnews.go.com

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Mar 20, 01:13

Measles Outbreaks Prompt Vaccine Questions

Measles outbreaks in Texas (279 cases) and New Mexico (38 cases) raise questions about vaccine boosters; the CDC recommends two doses, but most adults with two doses don't need another; outbreaks highlight the importance of complete vaccination.

Measles Outbreaks Prompt Vaccine Questions

Measles outbreaks in Texas (279 cases) and New Mexico (38 cases) raise questions about vaccine boosters; the CDC recommends two doses, but most adults with two doses don't need another; outbreaks highlight the importance of complete vaccination.

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Good Health and Well-being

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Why was a second MMR vaccine dose recommended in the late 1980s, and what were the epidemiological factors contributing to that decision?

The outbreaks highlight the importance of complete vaccination. A second dose wasn't initially needed because the single-dose vaccine was highly effective; the problem was low vaccination rates, not vaccine efficacy. Those born before 1957 likely have lifelong immunity due to prior widespread infection.

theguardian.com

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Mar 20, 01:12

Weakening Dark Energy Challenges Universe's Fate

The Dark Energy Spectroscopic Instrument (DESI) survey suggests dark energy, the force accelerating the universe's expansion, is weakening, challenging the constant dark energy model and suggesting a potential 'big crunch' instead of a 'big freeze'.

Weakening Dark Energy Challenges Universe's Fate

The Dark Energy Spectroscopic Instrument (DESI) survey suggests dark energy, the force accelerating the universe's expansion, is weakening, challenging the constant dark energy model and suggesting a potential 'big crunch' instead of a 'big freeze'.

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What specific observational evidence from the DESI survey supports the claim of weakening dark energy, and what are the limitations of this evidence?

The DESI survey mapped 15 million galaxies, spanning 11 billion years of cosmic history, creating a detailed 3D map of the universe. Analysis indicates dark energy reached peak strength when the universe was 70% of its current age and is now about 10% weaker. This contradicts the 'big freeze' prediction of the constant dark energy model.

abcnews.go.com

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Mar 20, 04:13

Early Amyloid Removal Halves Alzheimer's Risk in Genetic Study

A new study shows that an experimental treatment using amyloid-removing drugs has halved the risk of Alzheimer's symptom onset in a subset of 22 participants with a genetic predisposition to the disease, treated for an average of eight years, raising concerns about funding cuts that could halt the r...

Early Amyloid Removal Halves Alzheimer's Risk in Genetic Study

A new study shows that an experimental treatment using amyloid-removing drugs has halved the risk of Alzheimer's symptom onset in a subset of 22 participants with a genetic predisposition to the disease, treated for an average of eight years, raising concerns about funding cuts that could halt the r...

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How does this research advance our understanding of the amyloid hypothesis and its role in Alzheimer's disease progression?

This research connects the long-held amyloid hypothesis with tangible clinical outcomes. By removing amyloid plaques years before symptom onset, the study demonstrates a potential pathway for delaying or even preventing Alzheimer's. The success hinges on early, long-term intervention, highlighting the importance of genetic screening and proactive treatment for those at high risk.

dw.com

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Mar 20, 07:13

Euclid Telescope Releases First Data, Unveiling 26 Million Galaxies

The European Space Agency released the first data from its Euclid space telescope on March 19, 2024, revealing observations of 26 million galaxies, some 10.5 billion light-years away, to better understand dark energy and dark matter which are believed to make up 95% of the universe.

Euclid Telescope Releases First Data, Unveiling 26 Million Galaxies

The European Space Agency released the first data from its Euclid space telescope on March 19, 2024, revealing observations of 26 million galaxies, some 10.5 billion light-years away, to better understand dark energy and dark matter which are believed to make up 95% of the universe.

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What immediate impact does the first data release from the Euclid space telescope have on our understanding of the universe?

The European Space Agency (ESA) released the first data from the Euclid space telescope's mission on March 19, 2024. This initial dataset, representing just 0.5% of the total expected data, includes observations of 26 million galaxies, some up to 10.5 billion light-years away. The telescope, launched in 2023, aims to map one-third of the sky over its six-year mission, furthering our understanding of dark energy and dark matter.

Showing 409 to 420 of 3,322 results