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Fire Levers, Languages, Transportation on Water, Stone Weapons
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The Wheel, Writing, Agriculture, Metal Tipped Spears and Arrows, Leather Armor, Carts and Horses.
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Keystone Arch, Saddles, seagoing Galleys, Scale Armor, Early Chemistry
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Steel Weapons, Mathmatics, Stirrups, Sailing Ships, Crossbows, Chainmail.
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Gunpowder, Printing, Fully-rigged ships, Hot air Balloons, Muskets, Warships
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Mass Production, Steam power, Steam Ships, Railroads, Dynamite, Repeating Handguns, Direct Current Power.
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Cars, airplanes, radios, ocean liners, submarines, battleships, tanks, machine guns, fighter aircrafts, fission bombs, alternating currents, Hydroelectric Dams.
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Nuclear Energy, Computers, Lasers, Rockets, Jet aircrafts, Space Shuttles, Mag-lev Monorails, Hovercraft, Fusion Missiles, Kevlar, Organ Transplant.