@thltd_: Neolithic Europe had the earli...

Neolithic Europe had the earliest wheel, earliest gold metallurgy, earliest bronze metallurgy, earliest evidence of copper smelting, possibly the earliest writing, founded the earliest continually inhabited city (Plovdiv 6000 BC). Europeans (Sintashta) also invented the chariot.

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The world's oldest city, Catalhoyuk, was founded by Anatolian Neolithic Farmers, a population that contributed ~50% ancestry to modern Europeans (probably not the same subpopulation that founded Catalhoyuk, since ANF migrated into Europe from northwestern Anatolia).

Horse saddle was almost certainly invented by Indo-Europeans too, since domesticated horses were introduced to China by Indo-Europeans.

Crossbows: Invented independently in Europe and China.