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Imagine a swirl of milk in a cup of tea, or a drop of food colouring in a glass of water. The way liquids move and flow is intricate and almost impossibly complex. But that doesn’t stop scientists from trying to understand this movement.

A walk in the Australian bush can occasionally reveal piles of strange, cube-shaped poo, carefully balanced on top of rocks. Although it might seem like a prank, they’re perfectly natural. Chances are, this cube poo has been ejected from a wombat’s rear end.