Understand where technology comes from
Every technology responds to earlier challenges. Follow its story to understand why it emerged, what it solved, and what it made possible.
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All storiesFrom Controlled Fire to the Modern Energy SystemFire first became a controllable source of heat, then became part of fuel production, metallurgy, steam power, and electricity generation, eventually joining photovoltaics and power grids in the modern energy system.Read story
- From Symbolic Reasoning to Language Model AgentsFollow rule-based problem solving, learning from experience, deep networks, and language models to understand how computers acquired the ability to generate content and act, while tracing the parallel development of probabilistic reasoning, statistical learning, reinforcement learning, and diffusion-based generation.21 steps
- From Vacuum Tubes to the MicroprocessorA story of computing technology evolving from electronic switches, stored programs, and solid-state devices through the planar process, integrated circuits, and MOS large-scale integration, ultimately fitting a CPU onto a single chip.25 steps
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All technologies- Bolt-action repeating rifleLate 19th century: magazine-fed bolt-action rifles developed and became widespread · matureA rifle with a manually operated bolt and a magazine that feeds successive rounds; here, “repeating” does not mean automatic fire.
- Metallic cartridgesDeveloped in the mid-19th century; conversion applications around 1866 are the reference point verified in this review · matureMetallic cases hold ammunition components together and help seal breech-loading mechanisms, making them an important part of modern firearm systems.
- Hand cannon14th century: surviving artifacts or written records in both China and Europe · replacedAn early, small metal firearm held by a person and ignited with an external flame, without a complete ignition lock of the kind found on a matchlock.
- Reinforced concreteDeveloped from reinforced products into structural systems in the mid-to-late 19th century · matureConcrete incorporates reinforcing elements such as steel bars, which work together with it to improve tensile and flexural performance.
- Limestone calcined clay cement2009–2012: research on ternary systems; international technical validation began in 2014 · emergingCombines clinker, calcined clay, limestone and gypsum, using synergistic hydration to reduce the clinker content of cement.
- RiflingLate 15th century: the technology was already present in German regions · matureRifling inside the barrel spins a projectile to improve its stability in flight; it is a separate aspect of firearm technology from the ignition system.