Quantum Mechanics

In quantum entanglement, two particles become linked in such a way that the state of one instantly influences the state of the other, no matter how far apart they are. Einstein famously called this "spooky action at a distance," highlighting its counterintuitive nature in quantum mechanics.

Electron shells tend to fill in pairs, and atoms with completely filled or half-filled electron shells, often corresponding to an even number of electrons, exhibit enhanced chemical stability.

When certain materials are cooled below a critical temperature, they become superconductors, meaning they conduct electricity with zero resistance. A remarkable effect of this is the Meissner effect, where they expel magnetic fields, causing magnets to levitate stably above them without physical contact.

The third law of thermodynamics states that it's impossible to cool a system to absolute zero (0 Kelvin or -273.15 °C). As an object gets colder, it requires exponentially more energy to remove smaller amounts of heat, making the final step of reaching true zero an infinite challenge.

When helium is cooled to near absolute zero, it loses all viscosity and friction, allowing it to flow without resistance. This bizarre quantum state enables it to defy gravity by forming a thin film that creeps up and over container walls, a phenomenon known as the Rollin film effect.

Two entangled particles, even when separated by vast distances, remain connected such that measuring the property of one instantaneously influences the other. Einstein called this "spooky action at a distance."

When two particles become entangled, they remain connected in a way that measuring the state of one instantly determines the state of the other, regardless of the distance separating them. Einstein famously called this "spooky action at a distance."