Oil-pipeline leak-finding robot ball

Oil pipelines may not seem that interesting, but this robotic leak-finding ball is fascinating. http://www.bloomberg.com/video/how-to-spot-a-pipeline-leak-with-a-bowling-ball-fscSKsuTThCsZ5T172K32w.html

http://www.bloomberg.com/image/iaFrEnzXZFzY.jpg?dur=625