Fluoro highlighters, glow-in-the-dark paints or even high-viz witch's hats are bright, but they are nothing compared to these balls.

Scientists in the US and Denmark have created the brightest-known fluorescent materials in existence, by figuring out a reliable way to make fluorescent solids.

This discovery, published today in the journal Chem, could have potential applications in everything from solar energy to medical diagnostics and lasers, to perhaps even autonomous cars.

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