Only U.S. citizens are allowed inside the wind tunnel facility at NASA Ames Research Center at Moffett Field in Mountain View, Calif., where researchers put aeronautics to the test. James Martin/CNET William Warmbrodt, branch chief of the Aeromechanics Branch Flight Vehicle Research and Technology Division, talks about some of the advanced helicopter research taking place there. James Martin/CNET The wind tunnel is the largest in the world at 80x120 feet. It was built in the 1940s and uses 100 megawatts of power to generate the 100-knot winds. James Martin/CNET All Marvel franchises ranked, from Avengers to Daredevil: How do the X-Men movies stack up to Iron Man, Spider-Man and *shudder* Ghost Rider? Just so happens we made a list. How Muslim millennials are looking for love: Some call it haram (forbidden), but more Muslims than ever are turning to apps like Minder and Muzmatch to find romance.