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Countries in the world by population (2025)

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In 2025 , the world’s population is unevenly concentrated in a small group of highly populous countries, with India and China together accounting for more than one‑third of all people on Earth. Using the latest estimates of total population by country, this post presents an up‑to‑date list of every nation in the world by population, helping you quickly see which countries are growing, which are stabilizing, and how regional demographic patterns are shifting. From the dominance of Asia to the rapid rise of African nations like Nigeria and Ethiopia, these numbers provide essential context for understanding future trends in economics, migration, urbanization, and sustainability. The table provides a clear, rank‑wise list of all countries in the world by their estimated total population in 2025, allowing quick comparison of how people are distributed across nations. Source: Worldometer ( www.worldometers.info ) Elaboration of data by United Nations, Department of Economic and Social Affai...
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Why Do We Blush? The Evolutionary Reason for Red Cheeks

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Blushing—an involuntary reddening of the face—has puzzled scientists and poets alike for centuries. It’s a uniquely human response that can’t be faked, and yet, it often appears when we  most  want to remain unseen. So why does evolution retain this quirky trait? Let’s explore the biological roots, psychological layers, and evolutionary logic behind red cheeks. Blush of innocence—where wonder lights the eyes and cheeks bloom with pure, unfiltered joy Credits: GETTY 1.  Biology Behind the Blush: A Vascular Symphony At its core, blushing is a  physiological response  triggered by the  autonomic nervous system : The  sympathetic nervous system  (responsible for fight-or-flight) causes  dilation of blood vessels  in the face. This leads to increased blood flow, especially in the cheeks, neck, and sometimes ears—creating that unmistakable red flush. Adrenaline , released in response to emotional stimuli (like embarrassment), plays a key role....
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New 'acoustic metamaterial' cancels sound

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The mathematically designed, 3D-printed acoustic metamaterial is shaped in such a way that it sends incoming sounds back to where they came from, Ghaffarivardavagh and Zhang say. Inside the outer ring, a helical pattern interferes with sounds, blocking them from transmitting through the open center while preserving air's ability to flow through. Boston University researchers, Xin Zhang, a professor at the College of Engineering, and Reza Ghaffarivardavagh, a Ph.D. student in the Department of Mechanical Engineering, released a paper in  Physical Review B  demonstrating it's possible to silence noise using an open, ringlike structure, created to mathematically perfect specifications, for cutting out sounds while maintaining airflow. "Today's sound barriers are literally thick heavy walls," says Ghaffarivardavagh. Although noise-mitigating barricades, called sound baffles, can help drown out the whoosh of rush hour traffic or contain the symphony of music withi...
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