Distributia
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Steven MackintoshHimself - Narrator (voice)
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Kerstin Uvnäs-MobergHerself - Karolinska Institute (as Prof Kerstin Uvnas-Moberg)
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Lyudmila TrutHerself - Institute of Cytology and Genetics (as Dr Lyudmila Trut)
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Peter Rowley-ConwyHimself - Durham University (as Prof Peter Rowley-Conwy)
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Brian HareHimself - Duke University (as Prof Brian Hare)
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Kubinyi EnikoHerself - Eötvös Loránd University (as Dr Kubinyi Eniko)
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Anais RaccaHerself - University of Lincoln
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Greger LarsonHimself - Durham University (as Dr Greger Larson)
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Juliane KaminskiHerself - Max Planck Institute (as Dr Juliane Kaminski)
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Adam MiklosiHimself - Eötvös Loránd University (as Dr Adam Miklosi)
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Anna KukekovaHerself - Cornell University (as Dr Anna Kukekova)
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Morten KringelbachHimself - University of Oxford (as Dr Morten Kringelbach)
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Elinor KarlssonHerself - Broad Institute of MIT and Harvard (as Dr Elinor Karlsson)
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Daniel MillsHimself - University of Lincoln (as Prof Daniel Mills)