It's a disgusting, noxious smell. So naturally, researchers have created a perfume out of it. This isn't something you'd want to spritz on before a date (unless you really hated your date, in which case, why go?), but researchers figured that the general public might be interested in smelling a comet, even if the smell was horrible. They created the perfume to put on postcards that will be distributed at London's Summer Science Exhibition, a free science festival put on by The Royal Society. Just think of it like perfume samples in department stores, only less cloying and more disgusting.