Why is the sky blue? From a Newton's apple to a large Hadron collider.

"Researchers from Singapore and China have experimentally observed negative entanglement entropy using classical electrical circuits, providing new insights into quantum phenomena without the complexities of true quantum systems. Their work suggests that electrical circuits could serve as a low-cost platform for exploring exotic quantum behaviors, with implications for future quantum technologies. Credit: SciTechDaily.com" (ScitechDaily.com, Redefining Quantum Limits: Physicists Unlock the Secret of Elusive Negative Entanglement Entropy) Negative elusive entanglement entropy is one of the most beautiful ideas in quantum systems. When we entangle two different systems, we connect those systems, and that makes the entangled systems interesting. In the perfect quantum entanglement, the fate of two different systems is the same. And when one system is destroyed, the other will also destroyed. In the universe. All known systems are entangled. The universe connects all known system...

"Beams of light, shown in orange and blue, are shined on a surface acoustic wave resonator, where their interactions are controlled by a precisely designed cavity. Inside this echo chamber, the light becomes strongly coupled with the surface acoustic waves. Credit: University of Rochester illustration / Iyer et al." (ScitechDaily, Quantum Breakthrough: Scientists Use Sound Waves To Enable the Future of the Internet) In the regular internet, data travels in the form of electric impulses. That makes it quite easy to steal information from the system. The eavesdropper must capture the electric flow and find the zeros and ones from the electric flow. The system can see the eavesdropper if it can notice the energy loss the eavesdropping tool causes. However, the data that the attacker captured before the defender noticed the eavesdropper is in the wrong hands.  To see the loss of electricity requires excellent knowledge of the system. The electricity loss, or low voltage, cannot m...

"After the death of a massive, spinning star, a disk of material forms around the central black hole. As the material cools and falls into the black hole, new research suggests that detectable gravitational waves are created. Credit: Ore Gottlieb" (ScitechDaily, Dying Stars Send Out Gravitational Waves Across the Universe) Gravitational waves that originate in dying stars are interesting.  Previously, astronomers believed that only black holes could send gravity waves that are so high, that the sensors can detect them.  But the thing that dying stars send gravitational waves, that we can observe is also incredible. The precise moment when those waves leave from the dying stars is also interesting. That tells about the structure that pushes those waves to space.  If gravitational waves form when the supernova explosion is going on that means that the explosion's shockwave creates those waves. In some other models, the gravity waves form when the star collapses. At that mom...

  Mathematicians prove that Hawking was wrong about extreme black holes. That means it's theoretically possible that so-called naked singularity can form. The naked singularity means the black hole without an event horizon. A theoretical naked singularity is one of the most interesting. And enigmatic phenomena in the universe. The idea is that slowly rotating extreme black holes can form a so-called naked singularity. "In theoretical physics, an extremal black hole is a black hole with the minimum possible mass that is compatible with its charge and angular momentum." (Wikipedia, Extremal black hole)  When we talk about the surface of the black hole, we must describe it, do we mean the surface of the material that formed the black hole? Or do we mean the event horizon, the point where escaping velocity reaches the speed of light?  In theories, the material that formed a black hole is in the form called singularity. The space, material, energy, and time. Along with four fu...