Meet the kaon

Nearly 75 years after the puzzling first detection of the kaon, scientists are still looking to the particle for hints of physics beyond their current understanding. All Clifford Charles Butler and George Rochester knew for sure was that they'd discovered something new. Photographs from their cloud-chamber experiments at the University of Manchester revealed the tracks of two particles that behaved unlike anything they'd seen before. When the two physicists published their results in 1947 in the...