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Reinforced Concrete — The Invention That Built the 20th Century
On 16 July 1867 the gardener Joseph Monier filed patent No. 77165 for a system of "iron and cement tub-basins". This composite — concrete (30 MPa in compression) + steel (500 MPa in tension) — would become the most produced material in the world: ~4.1 billion tonnes of cement produced per year in 2023.
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Bitcoin — Satoshi Creates Decentralized Money
On 3 January 2009 at 18:15:05 UTC, Satoshi Nakamoto mined the Genesis block (block #0) of the Bitcoin network, carrying a 50 BTC reward and a message from the London Times. The first working decentralized digital money system, Bitcoin solves the double-spending problem without a trusted third party thanks to distributed proof-of-work consensus. By January 2025 the network had processed more than 1 billion transactions, and a single BTC is worth ~$100,000.
The Panama Canal — The Greatest Feat of Civil Engineering
Inaugurated on 15 August 1914, the Panama Canal crosses 80 km of isthmus with 3 sets of locks raising ships 26 m above sea level — ~310.7 million cubic yards (~238 million m³) of earth excavated over 33 years of construction, at a cost of ~645 million dollars across all phases and 27,609 human lives.
The Silicon Photovoltaic Cell — Bell Labs (1954)
On April 25, 1954, Bell Labs unveiled the first silicon solar cell with an efficiency of 6%. Daryl Chapin, Calvin Fuller, and Gerald Pearson transformed a phenomenon known since 1839 into a viable energy source — paving the way for an industry worth $400 billion by 2024.