📚 Trusted Sources

Caltech

Richard Feynman's legendary lectures, free online. Chapter 1 explains the double-slit experiment with bullets, water waves and electrons.

Used in:🔬 How Small Is Small?🌊 Waves or Particles? Both!🐱 Superposition & Measurement🧲 Spin: The Quantum Compass

MIT OpenCourseWare

MIT's full undergraduate course (videos, notes, problem sets) — the next step once you are ready for the math.

Used in:〰️ The Wave Function

IBM Quantum Learning

Free course by IBM on qubits, circuits and entanglement, with real quantum hardware to experiment on.

Used in:🐱 Superposition & Measurement🖥️ Quantum Computers & the Future

Khan Academy

Short video lessons on photons, atoms and the Bohr model, with practice exercises.

Used in:🔬 How Small Is Small?🪜 The Atom's Energy Ladder

Georgia State University

A concept map of physics by Prof. Carl Rod Nave. Great for quick, reliable definitions and numbers.

Used in:🔬 How Small Is Small?🔥 Energy Comes in Packets💡 Light Is Made of Particles🌊 Waves or Particles? Both!🪜 The Atom's Energy Ladder🎯 The Uncertainty Principle👻 Quantum Tunnelling🧲 Spin: The Quantum Compass📱 Quantum in Your Pocket

Stanford Encyclopedia of Philosophy

Peer-reviewed encyclopedia entry on what quantum mechanics says — and the open questions about what it means.

Used in:🎯 The Uncertainty Principle🐱 Superposition & Measurement🧲 Spin: The Quantum Compass🔗 Entanglement: Spooky Connections

NIST (U.S. National Institute of Standards and Technology)

How national labs use quantum physics for atomic clocks, sensors and quantum-safe cryptography.

Used in:📱 Quantum in Your Pocket🖥️ Quantum Computers & the Future

University of Colorado Boulder

Research-based simulations (photoelectric effect, lasers, quantum tunnelling…) used in classrooms worldwide.

Used in:🔥 Energy Comes in Packets💡 Light Is Made of Particles👻 Quantum Tunnelling📱 Quantum in Your Pocket

NobelPrize.org

Awarded “in recognition of the services he rendered to the advancement of Physics by his discovery of energy quanta”.

Used in:🔥 Energy Comes in Packets

NobelPrize.org

Einstein's Nobel Prize was for the law of the photoelectric effect — not for relativity.

Used in:💡 Light Is Made of Particles

NobelPrize.org

For his services in the investigation of the structure of atoms and of the radiation emanating from them.

Used in:🪜 The Atom's Energy Ladder

NobelPrize.org

For his discovery of the wave nature of electrons.

Used in:🌊 Waves or Particles? Both!

NobelPrize.org

For the creation of quantum mechanics.

Used in:🎯 The Uncertainty Principle

NobelPrize.org

For the discovery of new productive forms of atomic theory.

Used in:〰️ The Wave Function

NobelPrize.org

For his fundamental research in quantum mechanics, especially the statistical interpretation of the wave function.

Used in:〰️ The Wave Function

NobelPrize.org

Aspect, Clauser and Zeilinger: experiments with entangled photons, establishing the violation of Bell inequalities.

Used in:🔗 Entanglement: Spooky Connections

NobelPrize.org

Clarke, Devoret and Martinis: macroscopic quantum tunnelling and energy quantisation in an electric circuit.

Used in:👻 Quantum Tunnelling

UNESCO

The UN proclaimed 2025 the International Year of Quantum, marking 100 years since the birth of quantum mechanics.

Used in:🖥️ Quantum Computers & the Future

Physical Review Letters 49, 91

The original paper reporting a strong violation of Bell's inequalities with entangled photons.

Used in:🔗 Entanglement: Spooky Connections