So what we want to do is fine-tune that special characteristic of the light so it shines back and it doesn't absorb into the material and cause damage.

NPR: Using Science to Rescue Art

Andreas Schleicher, the OECD's special adviser on education, says a long-term characteristic of the UK's education system has been social division - with a polarisation between the results of rich and poor pupils.

BBC: UK weak in school fairness rankings