Over the past decade or more, Shanghai has grown like no other city on the planet. Home to 13.3 million residents in 1990, the city now has some 23 million residents (to New York City’s 8.1 million), with half a million newcomers each year. To handle the influx, developers are planning to build, among other developments, seven satellite cities on the fringes of Shanghai’s 2,400 square miles. Shanghai opened its first subway line in 1995; today it has 11; by 2025, there will be 22. In 2004, the city also opened the world’s first commercial high-speed magnetic levitation train line.