> In November 1940, philosopher Aloys Müller criticized Planck’s views in a Naturwissenschaften piece titled “Naturwissenschaft und reale Außenwelt” (“Natural Science and the Real External World”). A month later, Planck responded in print—and used the exact same title. This, Gingras and Khelfaoui suspect, caused Springer Nature’s copyright bot to retract the paper as plagiarism decades later, even though the contents of the two essays differ markedly.

> The debate over the Copenhagen interpretation remains active today, which explains why Gingras and Khelfaoui find the retractions so troubling: A key scientist’s views on an important controversy have been memory holed.

> Both Scarlata and Gingras are concerned that papers by less prominent scientists have disappeared as well without anyone realizing. At a minimum, Gingras wants Planck’s papers restored. “Whoever did it, I don’t care,” he says, “just put them [back] in the database. Intellectually, it’s not acceptable.”

Thanks, copyright bots.