Many ofBeijing's 91 universitiesconsistently rank among the best in theAsia-Pacificand the world.[30][31][32]Beijing is home to the two bestC9 Leagueuniversities(TsinghuaandPeking) in the Asia-Pacific andemerging countries.[33][34]Beijing CBDis a center forBeijing's economic expansion, with the ongoing or recently completed construction ofmultiple skyscrapers. Beijing'sZhongguancunarea is a world leading center of scientific and technological innovation as well as entrepreneurship. Beijing has been ranked theNo.1city in the world with the largest scientific research output by theNature Indexsince 2016.[35][36]The city has hosted numerous international and national sporting events, the most notable being the2008 Summer Olympicsand2008 Summer ParalympicsGames. In 2022, Beijing became the first city ever to host both theSummerandWinter Olympics,[37]and also theSummerandWinter Paralympics.[38]Beijing hosts175 foreign embassiesas well as the headquarters of many organizations, including theAsian Infrastructure Investment Bank (AIIB), theShanghai Cooperation Organisation (SCO), theSilk Road Fund, theChinese Academy of Sciences, theChinese Academy of Engineering, theChinese Academy of Social Sciences, theCentral Academy of Fine Arts, theCentral Academy of Drama, theCentral Conservatory of Music, and theRed Cross Society of China.