Why do we follow trends?

What's got rabbit-like ears, huge eyes, nine teeth and a demonic grin? It’s Labubu! These ugly-cute toys have gone viral online, largely thanks to social media’s trending machine. Their fame was previously limited to China and parts of Asia, but since 2024 their popularity has grown and the dolls can now be purchased in more than 30 countries round the world.

This week, the global demand for Labubu inspired us to play around with trend-based science. First up, we hear how the special sauce behind TikTok’s algorithm helps drive viral trends.

Next, we find out that humans are not the only ones that love a fad – chimpanzees are susceptible to them too!

We then discover what connects the hugely popular Beanie Baby toys of the 1990s with modern CubeSat exploration, thanks to aerospace engineer Professor James Cutler, from the University of Michigan.

Plus, we discuss a weird object thousands of light-years away that could lead to new physics.

And why do we find songs annoying after multiple listens?

All that, plus many more Unexpected Elements.

Presenter: Marnie Chesterton, with Godfred Boafo and Edd Gent Producers: Alice Lipscombe-Southwell, with Imaan Moin, Lucy Davies and Margaret Sessa Hawkins