What Is the Simulation Hypothesis?
Nick Bostrom's simulation argument explained: the trilemma, the physics objections, the consciousness problem, and what it would mean if our...
September 2025
April 2025
What Is Nuclear Fusion: The Science, the Breakthrough, and the Timeline
What is nuclear fusion: how it differs from fission, the NIF ignition breakthrough in 2022, ITER, tokamaks, private fusion companies, fusion fuel...
March 2025
What Is General Relativity?
A thorough explanation of Einstein's general theory of relativity: from the equivalence principle to curved spacetime, gravitational waves, black...
August 2024
Why Ships Float: Buoyancy and Archimedes' Principle Explained
A steel ship weighs thousands of tons yet floats easily. A small pebble sinks. Why? Archimedes' principle and buoyancy explain how shape — not...
Why Is the Sky Blue? Rayleigh Scattering Explained
The sky is blue because of Rayleigh scattering — smaller wavelengths of light scatter more in the atmosphere.
What Is Quantum Mechanics
A rigorous introduction to quantum mechanics: wave-particle duality, the uncertainty principle, entanglement, Schrodinger's equation,...
What Is Entropy: Disorder, Information, and the Arrow of Time
What is entropy? Explore Boltzmann's statistical mechanics, the second law of thermodynamics, Shannon's information theory, and why entropy gives...
What Is Cosmology? The Origin, Structure, and Fate of the Universe
Cosmology is the scientific study of the universe as a whole — its origin in the Big Bang, its large-scale structure, the mysteries of dark matter...
July 2024
How the Universe Began: The Big Bang and What Came Before
The Big Bang is the best-supported scientific account of the universe's origin — but it raises as many questions as it answers.
June 2024
How Nuclear Weapons Work: Physics, Strategy, and Existential Risk
Nuclear weapons derive their power from the physics of fission and fusion. This explainer covers how nuclear weapons work, the Manhattan Project,...
How Nuclear Energy Works: Fission, Reactors, and the Power of the Atom
How does nuclear energy work? Understand nuclear fission, chain reactions, reactor designs, safety systems, and why nuclear power is central to the...
How Gravity Works: From Newton's Apple to Einstein's Curved Spacetime
How does gravity actually work? Explore Newton's law of gravitation, Einstein's general relativity, gravitational waves, and the unsolved mystery...
Dark Matter and Dark Energy Explained: The 95% of the Universe We Can't See
Dark matter and dark energy together make up 95% of the universe, yet neither has been directly detected.
March 2024
What Is Thermodynamics?
Thermodynamics is the science of heat, energy, and entropy. Its four laws govern everything from steam engines to the arrow of time, living...
February 2024
What Is Particle Physics?
Particle physics seeks the fundamental constituents of matter and the forces that govern them.
February 2023
What Is Dark Matter and Dark Energy: What We Know and Don't Know
Dark matter and dark energy make up 95% of the universe, yet neither has been directly detected.