Reaching roughly 1990s capability. These topics push a rebuilding society past industrial-age basics into the technologies that define modern life. Each article assumes mastery of most earlier tiers.
Articles
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Internal Combustion — engines, fuel systems, and mechanical power
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Telecommunications — long-distance voice and data networks
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Organic Chemistry — carbon compounds, polymers, pharmaceuticals
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Nuclear Safety — radiation awareness, containment, and safe handling
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Aerodynamics and Flight — lift, drag, airframe design, propulsion
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Internet Infrastructure — packet switching, routing, protocols, and networked computing
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Advanced Materials — composites, alloys, ceramics beyond basic metallurgy
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Refrigeration — mechanical cooling, ammonia systems, cold chain
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Plastics Manufacturing — thermoplastics, molding, recycling
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Industrial Chemistry — Haber process, Solvay process, scale-up production