A behind-the-scenes battle at the world's top tennis tournaments pits an upstart newcomer and an established star.
In a small workshop just outside Tokyo, mechanics hammer, weld and measure as they craft "the Porsche of wheelchairs" for the world's top Paralympic athletes ahead of the 2020 Games.
As new self-driving vehicles appear on the streets, the traffic clogging our cities and highways could get a lot worse unless the roads themselves become smarter.
Entrepreneur Elon Musk's dream of an express tunnel transit system could finally become a reality in Las Vegas after major setbacks in other cities.
Cities could ease congestion and improve safety during snowstorms by tweaking the timing of traffic lights to take road conditions into account.