J.K. Rowling had an emotional reaction to a fan's 'Harry Potter'-inspired tattoo. ... And, turns out even the likes of J.K. Rowling aren't immune to shedding the odd tear over a bit of romance.

Graphene quantum dots (GQDs) with uniform sizes of less than 5 nm are synthesized by a novel top-down strategy. Nitric acid as a strong oxidant can be used to cut graphene oxide via sonication and ...