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Period: 3000 BCE to Feb 15, 1400
3000 BC to 1400 CE
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Jan 1, 618
Arched bridge
parts of the semi-circles and but them together to make a bridge. The bridge was stronger and wider. -
Jan 1, 850
GunPowder
Accidentally discovered by alchemists working with saltpeter looking for the secret to eternal life. MILITARY TECHNOLOGY -
Jan 1, 1300
Rockets
Rockets were powered by a black powder made of saltpeter, charcoal, and sulfur. The first rockets were fireworks -
silk
Silk is a Caterpillar home it keeps it protected.
