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The Mystery of Smell
We don't really know why one thing smells one way and why other things smell a different way. This is where the whole mystery of smell starts to be a big problem. We have in humans about 400 receptors with got potentially one trillion odor molecules that humans can respond to. So clearly, it can't be just a molecule receptor interaction. And there are definitely not a trillion different types of locks in your nose. There's only 400.