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Originally Posted by HansTWN
Or even less than 1000? 
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Hand canon, land mine (13th century, time when Europe sucked and we'd probably lose ancient greek's knowledge, if not arabs).
For modern inventions:
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Anti-ship ballistic missile: The anti-ship ballistic missile is a quasiballistic missile designed to hit a warship at sea. The Chinese military developed the "world’s first anti-ship ballistic missile system", although officials at the United States Navy are uncertain of the weapon's efficacy.[570] According to the U.S. Navy, the ASBM is currently in "initial operational capability" and is approaching deployment.[571]
Arteminisinin, anti-malarial treatment: The antimalarial drug of compound artemisinin found in Artemisia annua, the latter being a plant long used in traditional Chinese medicine, was discovered in 1972 by Chinese scientists in the People's Republic led by Tu Youyou (屠呦呦) and has been used to treat multi-drug resistant strains of Plasmodium falciparum malaria.[572]
Cloning, fish: In 1963, Chinese embryologist Tong Dizhou produced the world's first cloned fish by inserting the DNA from a cell of a male carp into an egg from a female carp. He published the findings in a Chinese science journal.[573] This occurred eleven years after the first alleged cloning of an animal, tadpoles in 1952, and 34 years before the cloning of Dolly the Sheep in 1996.
Electronic cigarette, electronic cigar, electronic pipe: The electronic cigarette, an electrical device that attempts to simulate the act of tobacco smoking, was invented in 2003 by Hon Lik, a Chinese pharmacist in Beijing. The patent for the invention is owned by Ruyan, a pharmaceutical corporation based in Hong Kong. The electronic cigarette consists of "a small lithium battery that atomizes a liquid solution of nicotine", producing a vapor that is inhaled.[574]
Heterosis in rice, three-line hybrid rice system: A team of agricultural scientists headed by Yuan Longping applied heterosis to rice, developing the three-line hybrid rice system in 1973.[575] The innovation allowed for roughly 12,000 kg (26,450 lbs) of rice to be grown per hectare (10,000 m2). Hybrid rice has proven to be greatly beneficial in areas where there is little arable land, and has been adopted by several Asian and African countries. Yuan won the 2004 Wolf Prize in agriculture for his work.[576]
Maglev wind power generators: In 2006, a new type of wind power generator employing magnetic levitation (maglev) was showcased at the Wind Power Asia Exhibition in Beijing.[577][578] Li Guokun was the chief scientific developer of the new maglev wind power generator, in collaboration with the Guangzhou Energy Research Institute under the Chinese Academy of Sciences and the Zhongke Hengyuan Energy Technology Company based in Guangzhou.[577][578] Li Guokun states that traditional wind turbines need high wind speeds to start, due to friction caused by their bearings.[577][578] The new frictionless maglev wind generator requires wind speeds of only 1.5 m per second (or 5 km an hour) to start and are expected to cut operational costs for wind farms by half, i.e. overall cost of roughly 0.4 Chinese yuan per kilowatt hour.[577][578]
Synthesis of crystalline bovine insulin: In 1965, Chinese scientists synthesized bovine insulin, with the "same crystalline form and biological activities as natural insulin."[579] The project began in 1958, and is considered one of the "first proteins ever synthesized in vitro."[580]
Tianhe interconnect, supercomputing: According to Ashlee Vance, Chinese researchers have developed an interconnect that "can handle data at about twice the speed of InfiniBand." This interconnect is essential to the Tianhe-IA, which is currently the second fastest supercomputer in the world.[581]
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Source.
That not counting crazy stuff like artificial chicken eggs: