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At the BBC’s request, science writer and entertainer Simon Watt set out to explore the fascinating biology and psychology behind the effect that looking at cute animals has on our brains.

There’s nothing quite like sitting and looking at animals with the ‘ahh!-factor' to make you feel good. What comes to mind – kittens, bunnies and bears? Of course, but there are so much more.

Yet, all this time, cute animals have been a staple of killing time online. So...why? Why is everyone posting about Moo Deng? First and foremost — and let this be imminently clear — because ...