Spring has sprung — and in many parts of the world, you can smell it. The air might smell sweeter, with notes of budding florals and pollen. But there are complex parts of the scent, too, more ...

Can you imagine smelling something rotten, like weeks-old meat or cigarette smoke, but there is nothing around you? This may be a phantom smell, or phantosmia — one way that your brain can play tricks ...