Researchers at Northwestern University have hit upon a way to give Blu-ray discs a second chance at usefulness: They make excellent molds for imprinting solar cells with quasi-random nanostructures. Even the ones with terrible movies on them.
Blu-ray Discs Make Solar Cells More Efficient
Here's a really good use for that Blu-ray version of Maleficent you bought because your significant other forced you to.