In an ideal world, you might imagine that scientific papers were only cited by academics on the basis of their content. This might be true. But lots of other stuff can have an influence.
The big mathematical challenge for flying robots is making them move in six dimensions: x, y, z, pitch, yaw and roll. We create 3-D obstacle courses in the lab - windows, doors, hula-hoops taped to posts - and ask the robots to fly through. It looks like a Harry Potter Quidditch match.
Since September 11, the U.S. has significantly improved its security to prevent another attack.
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