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Are sometimes like waves, and then sometimes like particles. Of electrons and suchlike is governed by chance! Where some of ‘em is and the rest of ‘em was.” Not everyone bought this. The comforting linkage of cause and effect. To tell him what quantum mechanics implied.
Sources:

annika.mu.nu
journals.aol.com
jdupuis.blogspot.com
sciencenotes.wordpress.com
www.plos.org
sortingoutscience.net