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Blue Needle Quartz Sphere 🤯 The blue needles inside this Quartz sphere are not mineral inclusions, but tiny gas-filled voids. Under bright light they glow blue due to the Tyndall effect, the same phenomenon that makes our sky appear blue. They only become visible at specific angles and create...

31,597 Aufrufe • vor 2 Monaten •via X (Twitter)

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When a nuclear reactor is switched on for the first time, an intense, almost hypnotic blue glow appears in the water surrounding the reactor core. This light is neither fire nor heat; it is Cherenkov radiation, a physical phenomenon that occurs when charged particles, such as high-energy electrons produced during nuclear fission, travel through a transparent medium faster than light can propagate within that same medium. While nothing can exceed the speed of light in a vacuum, light travels more slowly in materials like water. When a charged particle surpasses this reduced speed, it emits a coherent shock-like electromagnetic wave, often described as an optical analogue of a sonic boom. This radiation produces the distinctive blue glow. The colour arises because Cherenkov radiation is strongest at shorter wavelengths, which are dominated by blue and ultraviolet light. The phenomenon was first observed experimentally in 1934 and later explained theoretically, work that led to the Nobel Prize in Physics in 1958. Its explanation confirmed how relativity and electromagnetism operate in material media. Today, this deep blue light is both a warning and a scientific tool. It signals the presence of intense ionising radiation, while also being exploited in particle detectors, nuclear reactors, and neutrino observatories. It provides a rare, visible manifestation of subatomic processes that are otherwise hidden from direct human perception. #GottaLovePhysics #Physics

Erika 

276,032 Aufrufe • vor 7 Monaten

Man Was Released From Prison After 4 Years. .. His Dog Was Waiting In The Parking Lot "This was filmed yesterday morning at Northfield Correctional Facility in Ohio. The man is Marcus Thompson. 32 years old. Released after serving four years. The dog is Blue. Six-year-old Australian Shepherd. Marcus and Blue were together for two years before Marcus's incarceration in 2021. When Marcus went away, his sister Rachel took Blue. Promised to keep him safe. For four years, Rachel sent Marcus photos. Letters. Updates. Marcus had pictures of Blue taped to his cell wall. Counted down every day until release. Got out yesterday at 8 AM. Rachel was waiting in the prison parking lot. Blue in the backseat. Marcus walked out through the main gate. Carrying a small bag. His only belongings. Looked across the parking lot. Saw Rachel standing by her car. Then saw Blue. Blue saw Marcus at the same moment. Went absolutely insane. Started barking. Scratching at the car window. Rachel opened the door. Blue exploded out. Sprinted full speed across the parking lot. Didn't slow down. Launched himself directly into Marcus's chest. Hit him so hard both of them crashed to the pavement. Marcus dropped his bag. Wrapped both arms around Blue. Started sobbing. Deep, body-shaking sobs. Four years of holding everything in just broke open. Blue covering Marcus's face with kisses. Crying. Whining. Tail going crazy. Marcus couldn't speak. Just held Blue. Both of them on the parking lot asphalt. Rachel filmed everything. She said: "Blue remembered. Four years and Blue remembered Marcus instantly. The second he saw him, nothing else existed." Marcus finally stood up. Still holding Blue. Walked to Rachel's car. Blue wouldn't let go. Stayed pressed against Marcus the entire drive home. Marcus sent us a message this morning: "Four years in prison. Four years thinking Blue might forget me. But he remembered. He still loves me. That's worth every day I was inside." Sometimes freedom tastes like a parking lot reunion and a dog who waited four years to say welcome home.

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73,871 Aufrufe • vor 1 Monat