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A quantum enigma has been put to the test once again, but this time physicists have made the experiment smaller than it has ever been.
The classic double-slit experiment shows that light, electrons, atoms and some molecules are both particle-like and wave-like, a mysterious duality that has intrigued and puzzled scientists for more than a century.
Light or electrons are aimed at a solid plate with two parallel cuts in it, offering two choices: Go through the slit on the left or the slit on the right.
Subatomic particles will sometimes break the rules and go through both slits, just as a wave would.