It’s long been thought that sulfur dioxide emissions from things like coal-burning power plants need to react in sunlight to make sulfuric acid in the atmosphere. But a new discovery suggests there might be more to the story.
You are standing in a park in New Zealand. You look up at the top of a hill, and there, balanced on the ground, looking like it might catch a breeze and blow away, is a gigantic, rumpled piece of paper.
Except ... one side of it, the underside, is ... not there. You can see the sky, clouds, birds where there should be paper, so what is this?