Structural colour creations: Inkjet printing of a single transparent polymer ink on a hydrophobic substrate can create large-area full-colour images. (Courtesy: K Li, Chinese Academy of Sciences) ...

For a few extraordinary months each year, a remote river in central Colombia appears to transform into a flowing rainbow.

Whenever you spot a rainbow stretching across the sky after a monsoon shower, you think you're seeing the same arc of colours as everyone around you. But here's what science reveals: that rainbow is ...

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