Okay, that's … what the fuck? That's amazing!

We tend, I think, to imagine that the days of simple scientific 'miracles' – Newton and his prism, Fleming and penicillin – are at an end. Anything really useful will take years of work and a mountain of kit to make happen.

Nope. Take tartrazine, the food colouring used in Doritos, and paint it onto your skin. Shine a red light on it. Your skin is transparent!

How many medical applications does that have?!

https://www.theguardian.com/science/article/2024/sep/05/common-food-dye-found-to-make-skin-and-muscle-temporarily-transparent