Look! It's a pair of cute kittens demonstrating the laws of physics by playing around with one of those swinging metal ball things that business hotshots had on their desks in the 1980s. (Or a 'Newton's cradle', as it's also known).
A polite transatlantic hat-tip in the general direction of our US cousins at The Huffington Post for first alerting us to this video. Clearly, kittens over the other side of the Atlantic are far more advanced in their understanding of the laws of physics, and most specifically, momentum.
And if you'd like to see more cute kittens, we have a feeling you'll love this...