Fathomly Guides
110 in-depth explainers written for Fathomly, about 14 hours of reading. Each one has key terms and takeaways, and many come with a video to watch alongside.
History
Egypt, the Middle Ages, empires, world wars and the making of the modern world.
Ancient Egypt: three thousand years on the Nile
How a river, a calendar and a god-king produced one of the longest lasting states in history.
The Middle Ages in Europe
Lords, monasteries, towns and plague: what a thousand years between Rome and the Renaissance actually looked like.
The Islamic Golden Age
How Baghdad, Córdoba and Cairo became centres of translation, science and scholarship between the eighth and thirteenth centuries.
The Mongol Empire
How nomads from the steppe built the largest contiguous land empire in history, and what it did to Eurasia.
The Age of Exploration
Why European ships crossed the oceans in the fifteenth and sixteenth centuries, and how the exchange that followed changed every continent.
The Industrial Revolution
Coal, cotton and steam: how production moved from hands and homes to machines and factories, starting in eighteenth-century Britain.
The First World War
How an assassination in Sarajevo became a four-year war of trenches and industry that destroyed empires.
The Second World War
The deadliest conflict in history, from the rise of fascism to the atomic bomb, and the world order it left behind.
The Cold War
Forty-five years of rivalry between the United States and the Soviet Union, fought with nuclear threats, proxy wars and propaganda.
Decolonization and the new nations
How most of Asia and Africa won independence from European empires in the three decades after 1945.
Civilization
Farming, cities, empires, trade networks and the making of the modern state.
The agricultural revolution and the first cities
Why settled farming appeared, what it cost, and how it produced writing, law and inequality.
Greece and Rome: the political inheritance
Athenian democracy, the Roman republic and empire, and the institutional ideas that outlived both.
Trade routes and the exchange of ideas
The Silk Roads, Indian Ocean monsoon trade and trans-Saharan caravans, and what travelled besides goods.
Revolutions and the making of the modern state
How the political and industrial revolutions produced constitutions, nations and mass politics.
Psychology
Memory, attention, motivation and the biases that shape how people decide.
How memory actually works
Encoding, storage and retrieval, and why forgetting is a feature rather than a fault.
Attention, and why multitasking fails
What attention actually is, the hidden cost of switching, and how interruptions damage work you were not even doing.
Motivation: what actually sustains it
Intrinsic and extrinsic drives, the three needs behind durable motivation, and why rewards sometimes backfire.
Cognitive biases that distort your thinking
Systematic errors everyone makes, why they exist, and how they show up in schoolwork and arguments.
Sleep and the learning brain
What happens to memory overnight, what losing sleep really costs, and why the all-nighter is a bad trade.
Emotions and how they work
What emotions are for, what happens in the body and brain, and how people can learn to regulate them.
How habits form
Cues, routines and rewards: the science of why habits stick, and practical ways to build good ones and break bad ones.
Biology
Cells, genetics, evolution, the human body and how ecosystems hold together.
The cell: the unit everything living is built from
What is inside a cell, what each part does, and the difference between the two great classes of cell.
DNA, RNA and how a gene becomes a protein
The structure of the molecule, the code it carries, and the two steps that turn instructions into working machinery.
Evolution by natural selection
The mechanism in four conditions, the evidence behind it, and the misconceptions that cause most exam mistakes.
Human body systems, and how they cooperate
A tour of the major systems, what each one solves, and the principle that links all of them.
Ecosystems: energy, matter and why food chains are short
How energy moves through living systems, why it runs out quickly, and how matter differs by cycling.
Genetics and inheritance
From Mendel's peas to the human genome: how traits pass from parents to children and why siblings differ.
Viruses and bacteria
Two very different kinds of microbe: how each lives, how they cause disease and why they need different treatments.
Chemistry
Atoms, bonding, reactions and the chemistry of acids and bases.
Atoms and the periodic table
What atoms are made of, why electrons sit where they do, and why the table is shaped the way it is.
Chemical bonding and why substances behave differently
Ionic, covalent and metallic bonding, intermolecular forces, and how structure explains properties.
Reactions, equations and the mole
Conservation of mass, balancing, reaction types, and the counting unit that makes calculations possible.
Acids, bases and the pH scale
What makes something acidic, why the scale is logarithmic, and how buffers hold a solution steady.
States of matter
Solids, liquids, gases and plasma, what holds each together, and what happens when matter melts, boils or freezes.
Organic chemistry basics
Why carbon forms the backbone of life, how organic molecules are named and grouped, and where they show up every day.
Physics
Motion, energy, waves and electricity.
Motion and forces
Newton's three laws, what they actually claim, and the reasoning habits that make mechanics problems tractable.
Energy, work and power
Conservation, energy transfer, efficiency, and why energy is never really used up.
Waves, sound and light
Wave behaviour, the electromagnetic spectrum, and why light stubbornly behaves as both wave and particle.
Electricity and circuits
Charge, current, voltage and resistance, with the analogies that help and the ones that mislead.
Sound and hearing
How vibrations travel through air, why sounds have pitch and loudness, and how the ear turns waves into signals.
Magnetism
Why magnets attract and repel, how electricity and magnetism are linked, and how Earth's magnetic field protects life.
Earth and space
Plate tectonics, climate systems, and how stars and planets came to exist.
Plate tectonics: why continents move
The evidence for drifting plates, the three boundary types, and what each one builds or destroys.
Climate and weather: the system that moves heat
Why weather happens, how climate differs from it, and the physics behind the greenhouse effect.
The solar system, stars and the life cycle of matter
How the solar system formed, how stars work, and why almost every atom in you was made inside one.
Volcanoes and earthquakes
Why the ground shakes and mountains erupt, how scientists measure them, and how people reduce the danger.
The water cycle
How water moves between oceans, air, ice, rivers and underground, and why the cycle is changing as the planet warms.
Space
The planets, the Moon, exploration, galaxies and the search for life elsewhere.
A tour of the planets
From scorched Mercury to icy Neptune, what makes each of the eight planets distinct.
The Moon
How the Moon formed, why it has phases, what causes tides and eclipses, and what astronauts found there.
The history of space exploration
From the first rockets and Sputnik to the Moon landings, space stations and probes beyond the solar system.
Stars, galaxies and the universe
How astronomers measure the cosmos, what galaxies are, and the evidence that the universe began with the Big Bang.
Exoplanets and the search for life
How astronomers find planets around other stars, what they have found, and where life beyond Earth might exist.
Mathematics
Algebra, geometry, probability and how to approach unfamiliar problems.
Algebra: what the letters actually mean
Expressions, equations and functions, plus the rearrangement habits that stop most algebra errors.
Geometry and trigonometry
Angle reasoning, similarity, the Pythagorean theorem and the trigonometric ratios, tied together.
Probability and statistics, and how they get misused
Averages, spread, probability rules, and the reasoning errors that appear constantly in real arguments.
How to solve a problem you have not seen before
A general method for unfamiliar questions, and why practising retrieval beats rereading worked examples.
Numbers and number systems
How people learned to count, where zero came from, and the growing family of numbers from integers to irrational and imaginary ones.
Statistics in everyday life
Averages, samples, correlation and misleading graphs: the statistical ideas that help you read the news critically.
Nature
Rainforests, oceans, migration, reefs and the living systems of the planet.
Tropical rainforests
Why the forests around the equator hold more species than anywhere else on land, and what happens when they are cleared.
The ocean and its zones
From sunlit surface waters to the pitch-black trenches, how life changes with depth in Earth's largest habitat.
Animal migration
Why birds, whales, butterflies and wildebeest make long seasonal journeys, and how they find their way.
Pollination and pollinators
How flowers recruit bees, birds, bats and the wind to reproduce, and why a third of our food depends on it.
Predators and prey
How hunting shapes animal bodies and behaviour, and why removing top predators can transform a whole landscape.
Coral reefs
How tiny animals build structures visible from space, and why reefs are so rich and so fragile.
Fungi: the hidden kingdom
Neither plant nor animal, fungi recycle the dead, feed forests through underground networks and gave us bread, beer and penicillin.
Geography
Mountains, rivers, deserts, maps, climates and the growth of cities.
How mountains form
Colliding plates, volcanoes and slow erosion: the forces that raise the Himalayas and wear the Appalachians down.
Rivers and river systems
How rivers carve valleys, build deltas and support the cities that grew up along their banks.
Deserts of the world
Not all deserts are hot or sandy. What makes a desert, where they form and how life survives in them.
Reading maps: scale, projection and coordinates
Why every flat map of a round Earth distorts something, and how latitude, longitude and scale let you find any place.
Climate zones and biomes
Why the world is divided into tundra, taiga, grassland, desert and rainforest, and what decides which one you live in.
Population and cities
How the world's population reached eight billion, why birth rates fall, and why most people now live in cities.
Technology
How computers, the internet, the grid, GPS and encryption actually work.
How the internet works
Packets, addresses, routers and protocols: what actually happens between typing an address and seeing a page.
How computers work
From transistors and binary to processors, memory and software, the layers inside every computer.
The printing press and the information revolution
How Gutenberg's movable type made books cheap and helped drive the Reformation, the scientific revolution and mass literacy.
Electricity and the power grid
How electricity is generated, sent across countries and delivered to a wall socket, and why the grid must balance every second.
How GPS works
How a phone works out where you are from timing signals sent by satellites 20,000 kilometres overhead, with a little help from Einstein.
Batteries and energy storage
How chemical reactions store electricity, why lithium-ion took over, and what limits the batteries in phones and cars.
Encryption and online security
How secret codes evolved from Caesar's shifts to public-key cryptography that protects every online payment.
The history of flight
From balloons and gliders to the Wright brothers, jet engines and mass air travel, and the physics that keeps a plane up.
Health
The immune system, the heart, the brain, nutrition and public health.
The immune system
How the body recognises invaders, fights them off and remembers them, from skin and fever to antibodies and T cells.
The heart and circulation
How a fist-sized muscle pumps blood through about 100,000 kilometres of vessels, and what keeps it healthy.
Nutrition basics
What carbohydrates, proteins, fats, vitamins and minerals do, and what the evidence says about a healthy diet.
Antibiotics and antibiotic resistance
How penicillin changed medicine, how antibiotics kill bacteria, and why resistant infections are a growing global threat.
The brain
The structure of the brain, how neurons communicate, and what we know about how it changes over a lifetime.
Public health and epidemics
How clean water, vaccines and disease tracking added decades to human life expectancy, and how epidemics spread.
Arts
Painting, music, architecture, the novel and the language of film.
How to look at a painting
Composition, colour, light and context: a practical way to get more out of any picture in a gallery.
A short history of Western art
From cave paintings to conceptual art, the major movements and what each was reacting against.
How music works
Pitch, rhythm, harmony and form explained without jargon, with a look at how sound becomes music.
Architecture through the ages
Columns, arches, domes and steel: how building technology and belief shaped the world's great structures.
The story of the novel
How long prose fiction developed from ancient romances and The Tale of Genji to the modern bestseller.
The language of film
Shots, angles, editing and sound: the techniques filmmakers use to tell stories and how cinema began.
Philosophy
Ethics, logic, Stoicism, political thought and the world's religions.
What is philosophy?
The main branches of philosophy, the questions each one asks, and why the subject still matters.
Theories of ethics: consequences, duties and virtues
The three great approaches to right and wrong, what each gets right, and where each runs into trouble.
Logic and good reasoning
Deduction, induction and the common fallacies that make weak arguments sound convincing.
Stoicism: the philosophy of what you can control
How an ancient Greek and Roman school taught people to meet hardship calmly, and why its ideas are popular again.
The world's major religions
An even-handed introduction to the beliefs, practices and histories of the largest religious traditions.
Political philosophy and the social contract
Why should anyone obey a government? Hobbes, Locke, Rousseau and the debate over rights, liberty and justice.
Economics
Prices, money, inflation and how governments are put together.
Supply, demand and what prices are really doing
How markets set prices, what shifts a curve, and why price controls produce predictable side effects.
Money, inflation and how banks create deposits
What money is, where inflation comes from, and the mechanics people most often get wrong.
How governments are structured
Branches, constitutions, electoral systems, and how the design choices change political outcomes.
International trade and globalisation
Why countries trade, what comparative advantage means, and who wins and loses as the world economy integrates.
Personal finance basics
Budgeting, interest, debt, saving and risk explained in plain terms, with the principles that apply everywhere.
Food
The science of cooking, fermentation and the history of what we eat and drink.
The science of cooking
Why browning tastes good, how heat changes proteins and starches, and what salt, acid and fat really do.
Fermentation: bread, cheese, yogurt and more
How microbes have preserved and transformed food for thousands of years, from sourdough and kimchi to wine and miso.
The spice trade
How pepper, cinnamon, cloves and nutmeg drove trade networks, voyages of exploration and colonial wars.
The story of coffee and tea
How two plants from Ethiopia and China became the world's favourite drinks and reshaped trade, empires and social life.
The history of bread
From wild grains baked on hot stones to industrial loaves, how bread fed civilizations and sparked revolutions.
Sports
The Olympics, football, chess, board games and the science of exercise.
The Olympic Games
From a religious festival in ancient Greece to the world's largest sporting event, and the politics that followed it.
The history of football
How a chaotic medieval village game became association football, the most popular sport in the world.
The history of chess
How a war game from India travelled through Persia and the Islamic world to Europe, and how computers changed it forever.
The science of exercise
What happens inside the body during exercise, how muscles and lungs adapt, and how much activity health bodies recommend.
The story of board games
From the Royal Game of Ur and senet to Go, backgammon and Monopoly, five thousand years of playing on a board.