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📜 History 1,991
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The Hoover Dam generates about 4 billion kilowatt-hours per year — enough for 1.3 million homes.
Solar power has become cheaper than any other energy source in history — costs have dropped 90% since 2010.
The first nuclear power plant to generate electricity for a grid was in Obninsk, USSR, in 1954.
China invented playing cards in the 9th century — they reached Europe via the Middle East 500 years later.
China's Cultural Revolution (1966–76) under Mao destroyed vast amounts of cultural heritage and killed hundreds of thousands.
The Qing Dynasty's decline began with the Opium Wars (1839–42) — Britain forced China to legalize opium imports.
Ancient China's 'Nine-Chapter Mathematical Manual' (1st century AD) contained methods for solving linear equations.
The I Ching (Book of Changes) is one of the oldest Chinese texts — dating to around 1000 BC.
China's population reached 100 million during the Song Dynasty — making it the most populous country in the world.
The Tang Dynasty (618–907 AD) was a golden age of Chinese culture — poetry, art, and international exchange flourished.
The Yellow Emperor (Huang Di) is a legendary figure credited with founding Chinese civilization around 2700 BC.
Chinese mathematicians used decimal fractions and negative numbers centuries before Europe.
Chinese silk production was kept secret for over 2,000 years — exporting silkworms was punishable by death.
The Ming Dynasty produced the Yongle Encyclopedia (1408) — the largest encyclopedia ever compiled, 11,000 volumes.
China's Grand Canal, begun in 486 BC, is the longest artificial waterway in the world at 1,776 km.
The Confucian classic 'Analects' was compiled by Confucius's disciples after his death around 479 BC.
The Chinese invented mechanical clocks — Su Song's astronomical clock tower (1088 AD) predated European clocks.
Ancient Chinese bronzeware from the Shang Dynasty (1600–1046 BC) shows sophisticated metallurgical techniques.
China's Terracotta Army was discovered in 1974 by farmers digging a well — over 8,000 soldiers have been found so far.
Zhang Heng invented the first seismograph in 132 AD — able to detect earthquakes from hundreds of kilometers away.
The Yangshao culture (5000–3000 BC) in China practiced agriculture and produced painted pottery 7,000 years ago.
Ancient China had a sophisticated bureaucracy — the imperial examination system produced the world's first meritocratic government.
The Ming Dynasty built the Forbidden City in Beijing between 1406–1420 — using 1 million workers over 14 years.
Chinese astronomers recorded the 1054 AD supernova that created the Crab Nebula — no European records of it exist.
The Mongol Yuan Dynasty (1271–1368) under Kublai Khan was the first to rule all of China as foreigners.
The Song Dynasty (960–1279 AD) had the first paper money, the first permanent navy, and complex market economies.
China invented porcelain (china) around 600 AD — Europe couldn't replicate it for over 1,000 years.
Ancient Chinese medicine developed acupuncture, herbal remedies, and inoculation against smallpox centuries before the West.
The Han Dynasty (206 BC–220 AD) established the civil service examination — creating a meritocratic bureaucracy.
China's first emperor, Qin Shi Huang, standardized weights, measures, currency, and script across China in 221 BC.
The Great Wall of China took over 2,000 years to build — it's a series of walls built by multiple dynasties, not one structure.
The Silk Road connected China with the Mediterranean from around 200 BC — facilitating trade in silk, spices, and ideas.
China invented paper around 105 AD, gunpowder around 850 AD, printing around 1040 AD, and the compass around 1000 AD — four of the most transformative inventions.
Complexity theory and chaos theory have challenged reductionism — showing that the whole can be more than the sum of its parts.
The 'is-ought' gap prevents science from telling us what we should value — ethics requires normative reasoning beyond facts.
Naturalism holds that all phenomena have natural explanations — the supernatural is not invoked in science.
Scientism — the belief that science is the only valid way of knowing — is itself a philosophical claim, not a scientific one.
Emergence describes phenomena that arise in complex systems that cannot be predicted from their components alone.
The philosophy of measurement asks what it means to quantify something — measurement creates as much as it discovers.
The Duhem-Quine thesis holds that any theory can be defended by adjusting auxiliary assumptions — no single experiment can decisively refute a theory.
Scientific consensus is not equivalent to truth — but it represents the best current synthesis of evidence.
Inductive reasoning — drawing general conclusions from specific observations — is the foundation of empirical science.
Randomized controlled trials (RCTs) are the gold standard for establishing causation — observational studies show correlation.
The history of science is full of paradigm-defending resistance to correct new ideas — from germ theory to continental drift.
Science is a social enterprise — scientists' careers, funding, and reputations shape what research is produced.
Effect sizes matter more than p-values — a statistically significant result can have negligible practical importance.
Meta-analyses — pooling results from multiple studies — produce more reliable conclusions than any single study.
The law of large numbers ensures that as sample sizes grow, results approach the true population parameter.
Pre-registration — publicly stating hypotheses before collecting data — reduces selective reporting in research.
Science funding influences what questions get asked — industry-funded studies are more likely to produce results favorable to industry.