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735 facts in Technology. Click any fact to see its full page.
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The electric guitar was invented in the 1930s — its development transformed American popular music.
The theremin is one of the only instruments played without being touched — motion near two antennae controls pitch and volume.
The piano has 88 keys and can produce about 7.5 octaves — more range than most orchestral instruments.
Bamboo scaffolding is still widely used in Hong Kong and China — it is faster to erect and as strong as steel for many applications.
The Golden Gate Bridge has expanded up to 3 meters in summer heat and contracted in winter since 1937.
Heat islands in cities can be mitigated with green roofs, reflective surfaces, and urban forests.
Floating airports have been proposed and studied — Japan's Kansai International Airport was built on an artificial island.
Acoustic engineering in concert halls uses diffusion, absorption, and reflection to create ideal sound environments.
Earthship homes are built from discarded tires and aluminum cans, designed to be energy self-sufficient.
Skyscrapers are designed to sway, not stand rigid — flexibility prevents catastrophic failure in wind or seismic events.
The construction of the Suez Canal in 1869 reduced the shipping route between Europe and Asia by 7,000 km.
Building information modeling (BIM) digitally simulates every phase of a building's life before construction begins.
Smart glass can switch between transparent and opaque using an electrical charge — reducing heating and cooling needs.
The tallest wooden building in the world, Brock Commons in Vancouver, has 18 stories and uses mass timber construction.
Self-healing concrete, embedded with bacteria that produce limestone when cracked, could dramatically extend building lifespans.
The Hoover Dam holds enough concrete to pave a two-lane highway from San Francisco to New York.
Passive house design reduces heating and cooling needs by up to 90% through insulation, ventilation, and orientation.
Tuned mass dampers — giant pendulums inside skyscrapers — counteract wind-induced oscillation.
Floating architecture is growing as a response to rising sea levels — entire neighborhoods in the Netherlands are built on water.
Building codes have dramatically reduced earthquake deaths in developed countries — the death toll from equal-magnitude quakes differs by a factor of 100 between rich and poor countries.
The Three Gorges Dam in China is the world's largest power station by installed capacity.
Roman concrete contains volcanic ash and seawater that continues to strengthen over centuries, unlike modern concrete.
Geodesic domes, popularized by Buckminster Fuller, are structurally efficient because stress is distributed across all members.
The Sydney Opera House's iconic roof shells are not spheres — they are sections of a single sphere of the same radius.
Tokyo Skytree, at 634 meters, uses a central pillar with a five-story dampener to resist earthquakes.
The Panama Canal saves ships a 12,000-mile journey around South America and uses no pumps — it operates entirely by gravity-fed locks.
Robotic surgery allows for more precise, minimally invasive procedures with smaller incisions and faster recovery.
Telemedicine expanded dramatically during COVID-19 and has been shown to be as effective as in-person care for many conditions.
MRI technology was awarded a Nobel Prize in 2003 — it uses magnetic fields and radio waves, not radiation.
The pharmaceutical industry spends more on marketing than on research and development in many countries.
Austerity policies — cutting government spending during recessions — remain controversial; evidence suggests they can worsen downturns.
A country's central bank can create money by purchasing government bonds — this is called quantitative easing.
The gig economy has grown dramatically — in the US, over 36% of workers participate in some form of freelance or gig work.
Negative interest rates — paying banks to hold deposits — have been used by central banks in Europe and Japan since 2014.
The global arms trade is worth over $100 billion annually.
Automation has historically created more jobs than it destroys — but the transition periods cause significant hardship.
Cryptocurrency markets are largely unregulated and have experienced losses exceeding 70% from peak to trough multiple times.
Universal basic income trials have been conducted in Finland, Kenya, and Canada — results show improved health and wellbeing with modest effects on employment.
Microfinance — small loans to people without credit history — has been shown to reduce poverty in some contexts but has also been criticized for high interest rates.
More billionaires' wealth was created during the COVID-19 pandemic than in any comparable period in history.
Wind and solar energy are now the cheapest sources of new electricity generation in most of the world.
RSA encryption relies on the difficulty of factoring large numbers — a problem with no known efficient solution.
Napier's bones, invented in 1617, were physical rods used to perform multiplication before calculators.
NASCAR pit crews can change four tires and refuel in under 13 seconds.
Professional cyclists' bikes can weigh as little as 6.8 kg — the UCI minimum weight limit.
Speed cubers can solve a Rubik's Cube in under 4 seconds — the world record is 3.13 seconds.
The fastest recorded speed on a bicycle is 280.6 km/h by Denise Mueller-Korenek in 2018 — behind a dragster.
Architecture that uses passive solar heating, natural ventilation, and local materials is called vernacular architecture.
Modern animated films use motion capture technology by attaching sensors to real actors and mapping their movements onto digital characters.
3D printing in medicine has produced custom implants, hearing aids, and even human tissue scaffolds.