Another article explaining a previously theorized (1925) principle was displayed in full action. The principle was that fermions couldn't collide and turn at a 90 degree angle so there would be a dark halo after collisions of ultracold clouds of potassium-40 (40K). So there's a forbidden zone along the meridian of the collisions that particles couldn't go, and this team in Dunedin, New Zealand (Dr. Niels Kjærgaard from the University of Otago) managed to capture a picture of this collision and the halo and almost an imagined direction of particles outlined. (Posted July 11, 2016)
http://www.sci-news.com/physics/pauli-exclusion-key-principle-quantum-mechanics-04016.html
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