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Trains have been the fundamental backbone of transportation and shipping for a few hundred years. Despite the ubiquity of trains, the details of their workings are a bit of a mystery. Trains have come about as more of a feat of engineering than one of science. Thus, the detailed scientific theory of trains has remained…

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Our understanding of animal cognition has grown dramatically since the days of Jane Goodall in the 1960s. Great apes, a family of primates which includes chimpanzees, bonobos, and orangutans, are often the subject of psychological research. The present study explored an important aspect of social intelligence in these…