Why are cats so popular on the internet?

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There are countless pictures and videos of cats online, but what makes them so fitting for the internet? Anthrozoologist John Bradshaw and evolutionary geneticist Eva-Maria Geigl share their thoughts. (Photo: Celebrity cat "Brother Cream" attends Pet Show 2017 in Hong Kong Convention and Exhibition Centre in Wan Chai. Credit: Nora Tam/South China Morning Post via Getty Images)