
The year, 1421
Extract from: "1421” by G. Menzies

| Silk | 2640BC | ![]() |
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| Fired stoneware | 1500BC | ||
| Decimal system | 1350BC | ||
| Cast iron | 550BC | ||
| Iron plough | 500BC | ||
| The crossbow | 500BC | ||
| Magnetic compass | 350BC | ||
| Paper | 175BC | Sorting silk cocoons | |
| The wheel barrow | 150BC |
|
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| Stirrups | 150AD | ||
| Seismometer | 175AD | ||
| Woodblock printing | 500AD | ||
| Porcelain | 500AD | ||
| Gunpowder | 600AD | ||
| Paper money | 850AD | ||
| Abacus | 1200AD | A Mongol bomb thrown against a charging Japanese samurai during the Mongol invasions of Japan, 1281 |
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| Cargo ships | 1400AD |
GDP of 2014:| China | $US 10,360 billion |
| United States | $US 17,419 billion |
| European Union | $US 18,460 billion |