6,800 miles of fast track
In the six years since China opened its first high-speed rail line, the country's network has grown to 6,800 miles of dedicated track -- making it by far the world's largest system.
The scale of the project is simply massive, but it has also produced hundreds of billions of dollars in debt, a deadly accident and allegations of corruption.
10 of the most luxurious airline amenity kits
7 startups that want to improve your mental health
5 radical technologies that will change how you get to work