ScienceDaily
Stunning fossil discovery in Ethiopia rewrites human origins
Two newly identified species found side by side in Ethiopia's fossil record confirm that early *Homo* and an unknown *Australopithecus* species shared the same landscape 2.6 to 2.8 million years ago. The discovery dismantles the long-held image of a clean linear march from ape to human, replacing it with a far more complex picture of overlapping lineages. Researchers are now turning to diet and resource competition to understand how these ancient relatives managed — or failed — to coexist.
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Tropical rivers emerge as biggest oxygen-loss hotspots in a warming world
Oxygen levels in rivers worldwide are declining at an accelerating pace, with tropical waterways bearing the brunt of climate-driven deoxygenation, according to new research in Science Advances. The findings identify these ecosystems as critically vulnerable, threatening aquatic life and the billions of people who depend on tropical river systems. Scientists are calling for urgent intervention as warming trends show no sign of reversing.
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RNA's first letter may shape antiviral alarms, with A outpacing G
The first nucleotide of an RNA molecule — whether it begins with adenosine (A) or guanosine (G) — can meaningfully alter the strength of a cell's innate immune response to viral threats. Researchers at the IIMCB in Warsaw found that A-starting RNAs trigger a more potent antiviral alarm than their G-starting counterparts. The finding reframes how scientists think about RNA structure and immune activation, with potential implications for antiviral therapeutics and vaccine design.
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Scientists identify hidden accelerant in Antarctic ice loss
Antarctic ice loss may be unfolding faster than even dire predictions suggest. A new University of Maryland study finds that ocean circulation patterns — long omitted from sea level models — act as a hidden accelerant in glacial melt. The finding means current projections for end-of-century sea level rise could be significantly underestimating the threat.
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