Wave-particle duality is a fundamental principle of quantum mechanics stating that all matter exhibits both particle-like and wave-like properties.

The uncertainty principle states that the more precisely the position of a particle is known, the less precisely its momentum can be known, and vice versa.

Special relativity states that space and time are relative and depend on the observer's frame of reference, meaning that measurements of space and time can vary depending on the observer's motion.

Gravitational lensing is the bending of light around massive objects due to the curvature of spacetime caused by their gravitational field.

General relativity is Einstein's theory of gravity, which describes gravity as a curvature of spacetime caused by the presence of mass and energy.

The event horizon of a black hole is the boundary beyond which nothing, not even light, can escape from the black hole's gravitational pull.

Quantum tunneling is the phenomenon where particles can tunnel through a potential barrier even though they do not have enough energy to overcome it.

Schrödinger's cat is a thought experiment that illustrates the concept of quantum superposition, where a cat is simultaneously alive and dead until the box is opened and observed.

The conservation of energy principle states that the total energy of an isolated system remains constant, meaning that energy can neither be created nor destroyed, only transferred or transformed.

The equation E=mc^2, proposed by Albert Einstein, relates the energy (E) of an object to its mass (m) and the speed of light squared (c^2).

Wave function collapse is the phenomenon where the wave function of a particle collapses when it is observed or measured, resulting in a specific outcome.

The double-slit experiment demonstrated the wave-like behavior of electrons by showing that electrons could interfere with themselves, just like waves do.

The Franck-Hertz experiment demonstrated the quantization of energy in atoms by showing that electrons could only absorb or emit discrete amounts of energy.

The Anderson-Bridge experiment demonstrated the existence of antimatter by showing that positrons, the antiparticles of electrons, could be produced in high-energy collisions.

The Wu experiment demonstrated the violation of parity in weak interactions by showing that the beta decay of cobalt-60 produced more electrons in one direction than the other.