Do humans give off powerful pheromones that can control behaviour with just a whiff? That's been the theory for a while, but now a new study suggests they might not exist.
In an experiment volunteers smelled two potential pheromone chemicals while looking at photos of different male and female faces. If the chemicals worked as pheromones, some faces would seem more attractive than others - but that didn't happen.
It's weird to think that something like smell could be subconsciously changing our behaviour, so I'm glad this study suggests they don't work!