April has been a month of rapid expansion at CoursesHub. Today we're announcing four new courses spanning the life sciences, physical sciences, and geosciences. Each course features detailed derivations, inline diagrams, and structured data for every chapter. Here's what's inside.
Biochemistry — 26 Chapters
Our Biochemistry course covers the molecular machinery of life in 26 chapters organized into five parts. Part I: Building Blocks opens with amino acid structure, peptide bond geometry, and the Ramachandran plot, then moves to protein folding thermodynamics — including Anfinsen's experiment and the Levinthal paradox.
Part II: Enzymes and Kinetics derives the Michaelis–Menten equation from the steady-state approximation, covers competitive, uncompetitive, and mixed inhibition with Lineweaver–Burk plots, and introduces allosteric regulation through the Monod–Wyman–Changeux (MWC) model.
Part III: Metabolism walks through glycolysis, the citric acid cycle, oxidative phosphorylation (with Peter Mitchell's chemiosmotic hypothesis), fatty acid oxidation, and the urea cycle. Each pathway includes full reaction diagrams with enzyme names, cofactors, and ΔG values.
Parts IV and V cover nucleic acid biochemistry (DNA replication, transcription, RNA processing) and gene regulation (operons, enhancers, epigenetics, CRISPR-Cas9). The course concludes with signal transduction cascades and an introduction to systems biology.
Astrophysics — 16 Chapters
The Astrophysics course provides a graduate-level tour of the universe in 16 chapters. We begin with stellar structure and evolution — the Lane–Emden equation, the Eddington luminosity, and the Hertzsprung–Russell diagram — then move to compact objects: white dwarfs (Chandrasekhar limit), neutron stars (the Tolman–Oppenheimer–Volkoff equation), and black holes (Schwarzschild and Kerr metrics).
The middle chapters cover galactic dynamics (the collisionless Boltzmann equation, Jeans instability, spiral density wave theory), cosmology (Friedmann equations, CMB anisotropies, dark energy), and high-energy astrophysics (synchrotron radiation, inverse Compton scattering, gamma-ray bursts).
The final chapters address exoplanet detection methods (radial velocity, transit photometry, direct imaging, gravitational microlensing) and astrobiology — the habitable zone, biosignatures in exoplanet atmospheres, and the Drake equation.
Earth Sciences — 16 Chapters
Earth Sciences takes a quantitative approach to our planet's systems across 16 chapters. Solid Earth chapters cover plate tectonics (including the driving forces: ridge push, slab pull, and mantle convection), seismology (body waves, surface waves, the PREM model), and mineral physics (equations of state under extreme pressure).
Atmosphere and Climate chapters derive the radiative equilibrium temperature, explain the greenhouse effect quantitatively, and walk through general circulation models. We cover the Hadley cell, Ferrel cell, and polar cell, then derive the thermal wind equation that links temperature gradients to wind shear.
Hydrosphere chapters address ocean circulation (thermohaline conveyor, Ekman transport, geostrophic currents) and the hydrological cycle. The course closes with chapters on natural hazards (earthquakes, volcanic eruptions, tsunamis) and Earth system science — the interplay of the geosphere, atmosphere, hydrosphere, and biosphere over geological time.
Electrodynamics — 30 Chapters (Jackson Level)
Our most ambitious physics course yet, Electrodynamics covers 30 chapters at the level of Jackson's Classical Electrodynamics. The course opens with electrostatics (Coulomb's law, Gauss's law, boundary-value problems in Cartesian, cylindrical, and spherical coordinates) and proceeds through magnetostatics, Maxwell's equations, electromagnetic waves, waveguides and cavities, radiation theory, and special relativity.
Key derivations include the multipole expansion (both electrostatic and radiative), the Liénard–Wiechert potentials for moving charges, synchrotron and bremsstrahlung radiation spectra, the Fresnel equations for reflection and transmission at interfaces, and the covariant formulation of electrodynamics using the field-strength tensor Fμν.
Advanced chapters cover radiation reaction (the Abraham–Lorentz equation and its pathologies), magnetohydrodynamics, and plasma physics applications. The course includes over 200 worked examples and 50+ inline SVG diagrams of field configurations, charge distributions, and waveguide modes.
All Free, All Open
As with every course on CoursesHub, these four new offerings are completely free, require no account, and are available immediately. Each chapter includes structured data for search engines, so the content is discoverable from Google and other search tools. We hope these courses serve students, educators, and lifelong learners worldwide.