How Things Work: the machinery behind everyday things
Most of the things you rely on every day run on a mechanism you have never had a reason to examine. How does sound get from the air into your head? What is a screen doing when it shows you a colour? Why does one material shatter and another bend? This hub is the plain, physical account of how ordinary things work — built up from causes, not taken on faith.
Why the mechanism is the interesting part
Knowing that something works is useful. Knowing why is what lets you predict it, repair it, and recognise when a claim about it is nonsense. A fact without its mechanism is only half a fact, and the half that stays with you is usually the how. Each explainer here aims for the point where the thing stops being magic and starts being obvious.
Where to start
The first guide takes bone conduction — how vibrations reach your inner ear straight through the bones of your skull, and why your own recorded voice never sounds quite like you. It is a good example of the pattern this hub follows: one everyday puzzle, traced back to the physics that settles it. More mechanisms follow as the hub grows.
Last reviewed 10 July 2026
Understand it
How vibrations reach your inner ear through the bones of your skull, and why your recorded voice never sounds quite right.
Guide What MIL-STD-810 is (and what 'rugged' really claims)The US military environmental-test standard that 'rugged' devices cite — and why the specific method tested matters more than the label.
Guide How earthquake early-warning systems buy you secondsWhy a network of sensors can warn phones and infrastructure seconds before an earthquake's damaging shaking reaches them.
Guide The false-belief task: the experiment behind theory of mindThe classic experiment that pinpoints when children can hold someone else's mistaken belief apart from the truth.
Guide Why your own voice booms when you block your earsWhy sealing your ear canal makes your own voice sound loud and hollow — the everyday face of bone conduction.
Guide Two accounts of how you read other people's mindsThe two leading accounts of mind-reading — running an inner theory versus simulating the other person — and where they disagree.
Guide How a tuning fork finds the cause of hearing lossHow two quick tuning-fork tests separate a blockage in the outer or middle ear from a problem in the cochlea or nerve.
Guide The lightbulb cartel that defined planned obsolescenceHow a 1920s agreement to shorten lightbulb life became the clearest documented example of built-in obsolescence.
Guide How the Global Supply Chain WorksFrom factory to doorstep: the hidden system behind everything you buy.
Guide How Internet Search Engines WorkWhat happens when you type a query? The technology behind finding information instantly.
Guide How the Global Financial System WorksThe invisible infrastructure that lets you send money across borders in seconds.
Guide How the Water Cycle WorksThe endless journey of Earth's water, from clouds to rivers and back again.
Guide How the Immune System WorksThe body's defense network: how it fights infections and remembers past invaders.
Guide How the Electricity Grid WorksThe invisible network that delivers power from plants to your plug, 24/7.
Guide How solar panels convert sunlight into electricityPhotons knock electrons loose in silicon, creating an electric current.
Guide How GPS determines your exact locationGPS satellites broadcast time; your device triangulates your position.
Guide How WiFi transmits data wirelesslyWiFi converts data into radio signals that travel between devices and routers.
Guide How vaccines train your immune systemVaccines teach your body to recognize and fight off specific pathogens.
Guide How batteries store and release electrical energyChemical reactions inside a battery push electrons through an external circuit.
Guide How encryption keeps your data secureEncryption turns readable data into ciphertext that only authorized parties can decode.
Guide What is neuroplasticity?How the brain rewires itself through experience and recovery.
Guide How does the placebo effect work?Why a sugar pill can make you feel better.
Guide How do sleep cycles work?The stages of sleep and what happens in each.
Guide What are mirror neurons?How the brain mirrors others' actions and emotions.
Guide What is cognitive dissonance?The discomfort of conflicting beliefs and how we resolve it.
Guide How does the brain process pain?The neural pathways that create the experience of pain.
Guide How the Human Digestive System WorksStep-by-step breakdown of digestion and nutrient absorption.
Guide How the Human Circulatory System WorksThe heart’s pumping action and the double-loop circulation pathway.
Guide How the Solar System WorksThe structure and dynamics of the Sun, planets, and orbits.
Guide How GPS WorksSatellite signals, time synchronization, and position calculation.
Guide How the Human Brain WorksNeural communication and the functions of major brain areas.
Guide How does a touchscreen work?Capacitive and resistive touchscreens sense touch differently.
Guide How the Climate System WorksEnergy balance, greenhouse effect, and feedback loops.
Guide How does a QR code work?QR codes store information using patterns of squares and error correction.
Guide How does a compass work?A compass needle aligns with Earth's magnetic field to indicate north.
GuideFollow the rabbit hole
One idea leads to the next. Start anywhere.
- What is compound interest?A plain explanation of compound interest, why it accelerates, and why it matters for anyone saving or borrowing.
- How compound interest worksThe four moving parts — principal, rate, frequency and time — and how each one changes what you end up with.
- The compound interest formula, explainedWhat FV = P(1 + r/n)^(nt) actually says, term by term, with a worked calculation you can follow.
- The Rule of 72A mental shortcut for how long money takes to double — how it works, how accurate it is, and where it breaks down.
- Compound interest and inflation: real returnsWhy the growth you see is not the growth you get, and how to think about returns after inflation.
- Why compound interest makes pensions workHow decades of compounding do most of the work in a pension, and why starting earlier beats contributing more.
Questions people ask
Why does my recorded voice sound so different?
Live, you hear your own voice two ways at once — through the air and through the bones of your skull. Bone conduction adds low frequencies that make it sound fuller. A recording captures only the air-conducted sound, so it comes back thinner and higher: the version everyone else hears.
Can bone conduction help people who cannot hear?
It can help some kinds of hearing loss. If the outer or middle ear cannot pass sound but the cochlea still works, a bone-conduction or bone-anchored device sends vibration straight to the cochlea, bypassing the blockage. It does not help when the cochlea or auditory nerve itself is the problem.
Convert english to sinhala?
සූර්ය පැනල් විදුලිය නිපදවන්නේ හිරුඑළියේ ෆෝටෝන සිලිකන් සෛලවලට වැදී, ඉලෙක්ට්රෝන නිදහස් කර විදුලි ධාරාවක් ඇති කිරීමෙනි. මේ ක්රියාව ප්රකාශ-වෝල්ටීය බලපෑම ලෙස හැඳින්වේ. නිදහස් වූ ඉලෙක්ට්රෝන පැනලයේ පරිපථය හරහා ගලා යන අතර, එම විදුලිය නිවසක උපකරණ ක්රියාත්මක කිරීමට හෝ බැටරියක් ආරෝපණය කිරීමට භාවිතා කළ හැක.