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FourGreatInventionsoftheAncientChina•theEasternHanDynasty•CaiLunand‘CaiHou’paper•afterabout500years•Akindofprinting•InventedbyBiSheng•Agreatachievementinthehistory•TheWarringStates•Amagnetmadeintoashapeofspoon•Pointtothesouthwhenitstops•BeintroducedtoEuropeinthe13thcentury•Blackpowder•BeinventedinTangDynasty(9thcentury)•militaryaffairs•Guns,aircrafts•Papermakingtechnology•typography•compass•gunpowder