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171 articles with this tag
Science
Electrons in graphene can flow like a nearly frictionless liquid called a Dirac fluid, mimicking the quark-gluon plasma found at the birth of the univ...
Science
Most supermassive black holes sit quietly at the centers of galaxies, but some reignite after millions of years of dormancy, launching jets that stret...
Science
Ice cores drilled from glaciers and ice sheets preserve up to 1.2 million years of climate history in layers of frozen snow, trapped gas bubbles, and...
Science
Crowd crushes kill thousands worldwide through compressive asphyxia, not trampling. Understanding the physics of crowd density, pressure waves, and cr...
Science
Two reliable methods for measuring the universe's expansion rate give stubbornly different answers, and the gap is now so large that physicists suspec...
Technology
Terahertz radiation sits in a little-known gap between microwaves and infrared light. Once nearly impossible to harness, it now promises breakthroughs...
Health
MRI scanners depend on liquid helium to cool their superconducting magnets to near absolute zero. With global supply concentrated in just a few countr...
Science
The Atlantic Meridional Overturning Circulation is a massive ocean conveyor belt that carries heat northward, keeping Europe warm. Scientists warn it...
Health
Positron emission tomography uses radioactive tracers and gamma-ray detection to map metabolic activity inside the body, making it a vital tool for di...
Science
Sungrazing comets plunge within thousands of kilometers of the Sun's surface, enduring extreme heat and tidal forces. Most disintegrate, but their des...
Science
Piezoelectric materials generate electricity when squeezed and change shape when electrified. From quartz watches to medical ultrasound and next-gener...
Science
From parachute deployment to Navy diver extraction, here is how space agencies recover astronauts and capsules from the ocean — a method used since th...
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