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Technology Classes for Adults

121 free technology classes for adults (18+) on Wunder — short, fact-checked courses and lessons with narration and a quiz. Filter by age — each link is its own page, not a JavaScript toggle.

All agesKids (6)Adults (121)
Science (1463)Math (116)History (544)Language (47)Society (18)Literature (205)Technology (121)
⬆️
How to Escalate a Customs Vendor Finding
The 4:47 vendor mail says Monday. Cargo is sitting. Escalate on a written trigger, not on a slide.
🔍
How to Review a Customs Vendor After a Breach
The vendor PDF says no client data was touched. Cargo is still sitting. Review the live path, not the summary.
🔧
How to Improve a Customs Vendor After a Breach
A vendor email saying containment is complete is not improvement. Bound what broke, test the changed state, and do not let a ticket close ACE risk.
📱
A QR code is a doorway, not a menu
The square on the table holds a URL, not the dishes. Follow a factory code from DENSO WAVE to a sticker on a parking meter and a grocery pack that still keeps its U.P.C.
🏎️
How a Formula 1 Pit Stop Beats Two Seconds
See how a Formula 1 pit crew turns precise positioning, overlapping roles, specialised tools, practice, and safe release checks into a two-second wheel change.
🔦
How Lighthouse Fresnel Lenses Turn Lamps into Signals
See how stepped glass redirects a small lamp, rotates a beam across the sea, and gives each lighthouse a readable signature.
📱
How Recommendation Algorithms Work
You did not search. A list is already waiting. Traces become a metric, a sparse table, then a retrieve-and-rank funnel — not a mind-reader.
🛃
How to Dispute a Customs Cyber Claim
A reservation-of-rights letter is not a check. Bound the fight, test each loss against wording and cause, and do not let a settlement stand in for a live ACE path.
âš¡
How to Read Circuit Diagrams
Read circuit symbols, trace nodes, distinguish series from parallel connections, and place meters correctly on a schematic.
🔧
How Tunnel Boring Machines Work
Follow a tunnel boring machine from cutterhead and face pressure through segment rings, grout, steering, monitoring, and controlled breakthrough.
🚌
How Bus Schedules Stay Reliable
Learn how transit agencies turn headways into a workable schedule, absorb ordinary delay, prevent bus bunching, and measure the service riders actually receive.
💳
How Credit Card Payments Work
Follow a card payment from the first tap through authorization, clearing, settlement, billing, and disputes.
🚕
How Ride-Hailing Dispatch Works
See how ride-hailing platforms match moving riders and drivers, use batch decisions and dynamic prices, and measure whether an assignment became a completed pickup.
📶
How Cell Networks Work
Follow a phone from radio cells and shared spectrum through handoff, backhaul, and the core network that connects it to the internet.
🔎
How Search Engines Work
Follow a search engine from crawling and indexing through query interpretation, ranking, and the limits of an evolving web index.
🔗
How Blockchain Consensus Works
See how nodes validate transactions, choose between competing blocks, and use work, stake, votes, and finality rules to converge on a shared history.
⚙️
How Steel Is Made
Follow steel from prepared ore or sorted scrap through blast furnaces, electric arcs, refining, continuous casting, rolling, and recycling limits.
💽
How Hard Drives Work
See how spinning platters, magnetic heads, tracks, sectors, and a drive controller turn physical motion into the data your computer reads.
📶
How Bluetooth Works
Follow Bluetooth from advertising and pairing through frequency hopping, low-power connection events, and the profiles that make packets useful.
🛗
How Elevator Safeties Work
Follow an elevator overspeed event from the governor and its rope to the car safeties that grip the guide rails, then see why layered controls and qualified testing matter.
⚡
How Circuit Breakers Work
Learn how thermal and magnetic trips detect faults, how breakers interrupt arcs, and why ratings and vacuum interrupters matter.
🚗
How Hybrid Cars Work
Trace how a gasoline engine, electric motor, traction battery, power electronics, and regenerative braking work together in a hybrid car.
🏧
How ATMs Work
Follow a cash withdrawal from card and PIN through authorization, note dispensing, fraud checks, and the secure cash operations that keep an ATM ready.
🩻
How CT Scans Work
Follow an X-ray beam from rotating gantry to projections, reconstruction, calibrated slices, and the protocol choices that shape CT images.
🌐
How CDNs Work
Follow web content from an origin through edge caches, cache hits and misses, freshness rules, invalidation, and the tradeoffs behind a faster-feeling site.
🔌
How USB Works
Trace how USB carries power and data, how USB-C differs from USB speed, and how a host discovers and configures a device.
🧱
How Concrete Works Underwater
Learn how cement hydrates underwater, why water-cement ratio matters, and how tremie placement and anti-washout practice protect the fresh mix.
🚪
How Automatic Doors Sense and Move
Trace how automatic doors detect approach, separate activation from safety sensing, move through a control sequence, and choose safer responses to faults.
📱
How a Touchscreen Detects Your Finger
Follow a touch from the glass and electrode grid through capacitance measurements, coordinates, gesture recognition, and the app response.
🌡️
How Thermostats Decide When to Heat or Cool
See how thermostats sense temperature, switch equipment, use feedback and deadbands, and add smart scheduling without losing the basic control loop.
🔎
How to Govern a Customs Broker Cyber Incident
Define the decision, assign authority, test supplier evidence, and keep customs filing continuity visible after a cyber incident.
🛃
How to Escalate a Customs Broker Cyber Incident
Build an evidence-based escalation route for a customs broker cyber incident, from triggers and supplier evidence to filing continuity, claim boundaries, and reopening decisions.
🔎
Approve Cyber Risk After a Broker Breach
Make a bounded, evidence-based decision about supplier service, customs continuity, insurance duties, conditions, and residual risk after a client-data breach.
🛃
Monitor Cyber Risk After a Data Breach
Build an evidence-based monitoring plan for a customs broker after a data breach, from supplier signals and verification to filing continuity, thresholds, and reopening triggers.
🔎
How to Treat Customs Broker Cyber Risk
Choose, test, monitor, and close a customs broker cyber-risk treatment while protecting ACE continuity and keeping insurance duties separate from control decisions.
⚓
How Ports Work
See how pilots, traffic services, dredging, tugs, berths, and port-call planning turn a difficult arrival into a coordinated operation.
🔌
How Electric Vehicle Charging Works
Follow energy from the grid through AC and DC charging, batteries, connectors, smart controls, and the practical limits that shape every session.
🗄️
How Databases Work
Learn how indexes find rows, planners choose query strategies, transactions coordinate changes, and write-ahead logs make recovery possible.
🔎
How to Review Cyber Insurance for a Customs Broker
Map a customs broker's cyber exposures, test policy wording and limits, verify supplier evidence, and turn uncovered losses into owned continuity controls.
🔎
How to Settle a Customs Broker Cyber Claim
Bound a customs broker cyber claim, test causation and coverage, protect ACE continuity, reconcile payment, and keep supplier remediation under review.
🛃
How to Test Customs Broker Cyber Recovery
Test a customs broker’s recovery with an isolated environment, verified records and permissions, controlled ACE/ABI continuity checks, supplier evidence, cost tracing, and an accountable cutover decision.
🔎
How to Audit a Customs Broker's Cyber Incident Claim
Build a traceable audit of a customs broker's cyber incident: preserve evidence, test supplier and control claims, reconcile customs continuity, and show what a loss record can support.
🔍
How to Review a Customs Broker Cyber Incident
Review a customs broker cyber incident with a bounded timeline, supplier evidence, cautious causation, safe ACE continuity, and testable corrective actions.
🏙️
How Cities Work as Systems
Trace a city service from inputs to outputs, see how dependencies create cascades, and weigh measurement, control, trade-offs, and resilience.
🛃
How to Allocate Liability After a Customs Data Breach
Build a fact-based process for mapping supplier responsibility, preserving evidence, protecting customs continuity, and testing a remedy after a data breach.
🔎
How to Hand Off a Customs Broker Cyber-Risk Decision
Build a bounded handoff after a customs broker cyber incident, connecting evidence, operational continuity, authority, insurance duties, and monitored next steps.
☁️
How Cloud Computing Works
Learn what the cloud means, how pooled resources scale, how IaaS, PaaS, and SaaS differ, and why data centers still matter.
🔎
How to review a customs broker after a cyber breach
Trace a customs broker’s data path, test supplier controls, preserve breach evidence, and make a bounded continuity decision without guessing about insurance coverage.
🔎
How to close a customs broker cyber-incident review
Close a supplier cyber-incident review with evidence, residual-risk boundaries, customs continuity checks, and clear reopening ownership.
📣
How an online ad gets chosen
Trace an online ad from page request to auction, then separate contextual signals, tracking, consent, and campaign measurement.
📘
How a bridge expansion joint works
To understand how road decks accommodate heat, cold, traffic, and movement.
🛫
How does air traffic control work?
Look down on a busy airport: one jet rolls, another lands, and more sit above the cloud. Nobody is improvising.
💳
How do credit cards work?
Follow a card purchase from instant authorization to settlement and a monthly bill, then see how grace periods, APR, payments, credit reporting, and disputes change its cost.
WH
How Warehouses Work
Follow receiving, putaway, pick paths, slotting, automation, WMS records, replenishment, and warehouse service design.
BG
How Airport Baggage Systems Work
Follow bag tags, conveyors, sortation, screening, flight build-up, transfers, reclaim, tracking, and recovery through an airport baggage journey.
🛃
How Customs Trade Remedy Reviews Work
The cash deposit on an anti-dumping entry is not the bill. Reviews recalculate the past and reset the rate that comes next.
AP
How Customs Trade Remedy Appeals Work
Follow jurisdiction, filing windows, agency records, Court of International Trade review, remand, stays, Federal Circuit appeals, and entry-level implementation through a trade-remedy appeal.
IS
How Customs Importer Security Filings Work
Follow shipment scoping, 10+2 data elements, importer responsibility, source records, loading deadlines, ACE transmission, updates, and filing controls through an Importer Security Filing.
RC
How Customs Reconciliation Works
Follow issue scoping, underlying entries, ACE flags, evidence registers, reconciliation filings, liquidation, payment or refund, and preventive controls through a customs reconciliation.
CE
How Customs Broker Continuing Education Works
Follow covered license holders, triennial periods, 36-hour targets, initial transition rules, eligible learning, completion evidence, reporting, status reports, fees, and preventive controls through customs broker continuing education.
OR
How Customs Origin Rules Work
Follow provenance, preferential and non-preferential rules, tariff shifts, regional value, cumulation, origin evidence, verification, and change control through a customs origin decision.
AD
How Customs Anti-Dumping Duties Work
Follow dumping, normal value, export price, injury, causation, investigations, orders, cash deposits, reviews, circumvention, and importer controls through an anti-dumping duty case.
CD
How Customs Countervailing Duties Work
Follow government financial contributions, benefit, specificity, subsidy calculation, injury, causation, investigations, provisional measures, orders, reviews, and importer controls through a countervailing-duty case.
SG
How Customs Safeguard Measures Work
Follow increased imports, serious injury, causation, investigations, tariff-rate quotas, provisional relief, adjustment, notifications, and importer controls through a customs safeguard measure.
EU
How Customs End-Use Works
Follow eligibility, authorisation, prescribed use, customs supervision, records, deadlines, and discharge through an end-use duty relief.
TS
How Customs Temporary Storage Works
Follow presentation, facility approval, receiving, inventory, permitted handling, movements, deadlines, exceptions, and final outcomes through customs temporary storage.
DB
How Customs Duty Drawback Works
Follow eligible imports, export and destruction events, unused and manufacturing drawback, substitution, calculations, records, filing, and review through a duty-refund claim.
DR
How Customs Duty Relief Works
Follow legal exceptions, eligible importers and goods, household and institutional reliefs, temporary and returned goods, evidence, post-release conditions, and correction through a customs duty-relief decision.
BR
How Customs Binding Rulings Work
Follow advance-ruling scope, product evidence, applications, legal reasoning, publication, validity, declaration use, modification, review, and controls through a customs binding ruling.
TC
How Trade Compliance Programs Work
Follow ownership, product data, classification, valuation, origin, screening, permissions, testing, and corrective action through a trade compliance program.
CV
How Customs Valuation Works
Follow transaction value, required additions, assists, royalties, related-party pricing, comparable goods, deductive value, computed value, fallback methods, and records through a customs valuation decision.
FD
How Food Delivery Logistics Work
Follow orders from menu and kitchen capacity through packaging, dispatch, batching, route planning, food safety, handoff, and exception recovery.
CW
How Customs Warehousing Works
Follow authorisation, duty suspension, warehouse receipts, inventory control, permitted handling, and final removal through customs warehousing.
TA
How Customs Temporary Admission Works
Follow eligibility, specific use, declarations, ATA carnets, identity controls, deadlines, re-export, and alternative discharge through a temporary-admission procedure.
IP
How Customs Inward Processing Works
Follow authorisation, imported inputs, processing records, yield, equivalent goods, discharge, export, and local release through inward processing.
OP
How Customs Outward Processing Works
Follow temporary export, authorisation, identity controls, processing abroad, valuation, re-import, and discharge through outward processing.
CS
How Container Shipping Works
Follow the standardized box from booking and packing through verified weight, terminal handling, ship stowage, ocean transit, inland delivery, and empty repositioning.
🛫
How Air Traffic Control Works
Controllers do not fly the airplane. They hold the shared picture that lets many crews use the same sky.
AC
How Air Cargo Works
Follow shippers, forwarders, air waybills, acceptance, screening, ULDs, aircraft loading, customs, and delivery through an air-cargo journey.
DW
How Dishwashers Work
Follow water, detergent, spray arms, sensors, filtration, and drying through a dishwasher cycle.
WC
How Toilets Flush
Follow stored water, flush valves, bowl flow, siphons, trap seals, refill, and efficiency through a toilet cycle.
🔧
How does a food label get regulated
A clear, beginner-friendly tour of how does a food label get regulated.
🔧
How does a train switch tracks
A clear, beginner-friendly tour of how does a train switch tracks.
🔧
How Two-Factor Authentication Works
See how independent evidence protects an account beyond a password.
🔧
How Recycling Plants Sort Materials
Follow screens, magnets, air, and optical systems through a sorting line.
🔧
How Speakers Make Sound
Trace amplifier current through magnet force, cone motion, and air pressure.
🔧
How does a bank loan get approved
A clear, beginner-friendly tour of how does a bank loan get approved.
🔧
How does a satellite phone work
A clear, beginner-friendly tour of how does a satellite phone work.
🔧
How does a skyscraper resist wind
A clear, beginner-friendly tour of how does a skyscraper resist wind.
🔧
How does a bond work
A clear, beginner-friendly tour of how does a bond work.
🔧
How Firewalls Protect Networks
How packets meet rules, zones, logs, and layered network defenses.
🔧
How a Sewing Machine Makes a Stitch
Follow needle, bobbin, hook, and feed motion through a lockstitch.
🔧
How an Escalator Works
See how linked steps, chains, tracks, and sensors move people continuously.
🔧
How Currency Exchange Rates Get Set
Understand orders, expectations, spreads, and the market price of a currency.
🔧
How Nuclear Power Plants Make Electricity
Trace fission heat through steam, turbines, generators, and safety systems.
🔧
How a Car Transmission Works
Learn how gears trade torque and speed while the engine stays useful.
🔧
How does a bicycle stay upright
A clear, beginner-friendly tour of how does a bicycle stay upright.
🔧
How does a vending machine identify coins
A clear, beginner-friendly tour of how does a vending machine identify coins.
🔧
How does the electricity grid stay balanced
A clear, beginner-friendly tour of how does the electricity grid stay balanced.
🔧
How does a mobile phone call connect
A clear, beginner-friendly tour of how does a mobile phone call connect.
🔧
How does a jet stay in the air
A clear, beginner-friendly tour of how does a jet stay in the air.
🏙️
Skyscrapers: Engineering the Sky
How buildings learned to touch the sky — steel, elevators, wind, and the engineering that keeps supertall towers standing.
🛬
Concorde & Supersonic Flight
The story of Concorde — the sound barrier it had to conquer, the Anglo-French engineering gamble that built it, the Mach 2 machine that stretched and glowed in flight, and the beautiful economics that never quite worked.
🪟
How Glass Became Invisible
Stand under the rose at Chartres. The thick edge is a cut, not a sag — and the same melted sand now carries your messages as light.
🚢
Giant Ships: How the Biggest Things Float
Why steel ships weighing hundreds of thousands of tons float, and how the box, the megaship, the port, and the canal move ninety percent of everything you own.
🧱
Concrete: The World's Material
The most-used material on Earth after water: what concrete really is, how the Romans mastered it, and its honest carbon reckoning.
⚙️
Iron & Steel
How humanity learned to pull iron from rock and turn it into steel — the metal that built the modern world.
🚧
Megaprojects: Tunnels, Dams & Canals
How humanity carves through mountains, dams great rivers, and joins oceans — the triumphs, the death tolls, and the honest overruns of the world's greatest megaprojects.
🔌
The Grid: How Electricity Reaches You
Follow electricity from the generator to your outlet — why voltage goes high to travel, how the grid stays balanced at 60 hertz every second, and what happens when the balance breaks.
🚁
Helicopters: How They Really Fly
The honest physics of helicopters — why hovering is brutally hard, how the rotor really works, and what these machines do that nothing else can.
📷
How Cameras Work
From a dark box with a pinhole to the computer in your phone — the real optics and physics behind every photograph.
📊
Excel & Spreadsheets Essentials
Master the spreadsheet grid, formulas, functions, and charts that power Excel and Google Sheets alike.
🚢
Aircraft Carriers: Cities at Sea
From Taranto and Midway to the 3-wire, nuclear cores, and a 5,000-person crew — how a moving airbase took the ocean from the battleship.
🌐
How the Internet Was Born
From packet switching and ARPANET's first crashed message to email, the Web, and the cables it lives on, how the internet was actually built and who runs it.
🛩️
Fighter Jets: How They Fly and Fight
How jet propulsion, supersonic flight, radar, stealth, and human physiology combine to make the modern fighter aircraft.
🧊
Icebreakers: Ships That Crush the Poles
The engineering of ships that conquer frozen seas — how a sloped hull crushes ice from above, why the poles demand nuclear power, and how icebreakers open the Arctic that climate change is unlocking.
🌊
Submarines: The Silent Deep
How machines learned to sink, survive, and see in the crushing dark — from wooden Turtle to nuclear Nautilus and the deep-diving Trieste.
🔧
How Car Engines Work
A precise tour of the internal combustion engine — the four-stroke cycle, the moving parts, and how electric motors honestly compare.
🚲
The Bicycle: A Perfect Machine
Why the bicycle is the most efficient machine ever built to move a human, how it balances, and how it quietly reshaped freedom, cities, and sport.
🏍️
Motorcycles: Machines & Culture
How a motorcycle actually stays upright, why engines sound the way they do, and the marques, races, and gear that built two-wheeled culture.

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